989010101 has 2 divisors, whose sum is σ = 989010102. Its totient is φ = 989010100.

The previous prime is 989010091. The next prime is 989010103. The reversal of 989010101 is 101010989.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 800607025 + 188403076 = 28295^2 + 13726^2 .

It is a cyclic number.

It is not a de Polignac number, because 989010101 - 2¹⁸ = 988747957 is a prime.

Together with 989010103, it forms a pair of twin primes.

It is a Chen prime.

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

989010101 is a modest number, since divided by 10101 gives 989 as remainder.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (989010103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 494505050 + 494505051.

It is an arithmetic number, because the mean of its divisors is an integer number (494505051).

Almost surely, 2^989010101 is an apocalyptic number.

It is an amenable number.

989010101 is a deficient number, since it is larger than the sum of its proper divisors (1).

989010101 is an equidigital number, since it uses as much as digits as its factorization.

989010101 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 648, while the sum is 29.

The square root of 989010101 is about 31448.5309831795. The cubic root of 989010101 is about 996.3231980293.

It can be divided in two parts, 9890 and 10101, that added together give a palindrome (19991).

The spelling of 989010101 in words is "nine hundred eighty-nine million, ten thousand, one hundred one".