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989898787898989 is a prime number
BaseRepresentation
bin1110000100010011101100010…
…1100111011100011001101101
311210210221101210112111120202221
43201010323011213130121231
52014222000204200231424
613425201120351515341
7415335553525061413
oct34104730547343155
94723841715446687
10989898787898989
1126745979a185051
1293035025228b51
133364709424c2a7
14136634dd7672b3
157969814a429e4
hex3844ec59dc66d

989898787898989 has 2 divisors, whose sum is σ = 989898787898990. Its totient is φ = 989898787898988.

The previous prime is 989898787898959. The next prime is 989898787899001.

989898787898989 is nontrivially palindromic in base 10.

989898787898989 is an esthetic number in base 10, because in such base its adjacent digits differ by 1.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 984702517200900 + 5196270698089 = 31379970^2 + 2279533^2 .

It is a palprime.

It is a cyclic number.

It is not a de Polignac number, because 989898787898989 - 27 = 989898787898861 is a prime.

It is a super-2 number, since 2×9898987878989892 (a number of 31 digits) contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (989898787898959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 494949393949494 + 494949393949495.

It is an arithmetic number, because the mean of its divisors is an integer number (494949393949495).

Almost surely, 2989898787898989 is an apocalyptic number.

It is an amenable number.

989898787898989 is a deficient number, since it is larger than the sum of its proper divisors (1).

989898787898989 is an equidigital number, since it uses as much as digits as its factorization.

989898787898989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 54611115245568, while the sum is 124.

It can be divided in two parts, 989898 and 787898989, that added together give a palindrome (788888887).

The spelling of 989898787898989 in words is "nine hundred eighty-nine trillion, eight hundred ninety-eight billion, seven hundred eighty-seven million, eight hundred ninety-eight thousand, nine hundred eighty-nine".