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BaseRepresentation
bin111011000000001…
…010100011101101
32112222200002010112
4323000022203231
54011403231424
6242120545405
733350000612
oct7300124355
92488602115
10989898989
11468854842
12237622265
1312a111661
149567c509
155bd8860e
hex3b00a8ed

989898989 has 2 divisors, whose sum is σ = 989898990. Its totient is φ = 989898988.

The previous prime is 989898983. The next prime is 989898997.

989898989 is nontrivially palindromic in base 10.

989898989 is an esthetic number in base 10, because in such base its adjacent digits differ by 1.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 779358889 + 210540100 = 27917^2 + 14510^2 .

It is a palprime.

It is a cyclic number.

It is not a de Polignac number, because 989898989 - 220 = 988850413 is a prime.

It is a Chen prime.

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

989898989 is an undulating number in base 10.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (989898983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 494949494 + 494949495.

It is an arithmetic number, because the mean of its divisors is an integer number (494949495).

Almost surely, 2989898989 is an apocalyptic number.

It is an amenable number.

989898989 is a deficient number, since it is larger than the sum of its proper divisors (1).

989898989 is an equidigital number, since it uses as much as digits as its factorization.

989898989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 241864704, while the sum is 77.

The square root of 989898989 is about 31462.6602339980. The cubic root of 989898989 is about 996.6215955701.

The spelling of 989898989 in words is "nine hundred eighty-nine million, eight hundred ninety-eight thousand, nine hundred eighty-nine".