90931879009 has 2 divisors, whose sum is σ = 90931879010. Its totient is φ = 90931879008.

The previous prime is 90931878971. The next prime is 90931879079. The reversal of 90931879009 is 90097813909.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 49764686400 + 41167192609 = 223080^2 + 202897^2 .

It is a cyclic number.

It is not a de Polignac number, because 90931879009 - 2⁹ = 90931878497 is a prime.

It is not a weakly prime, because it can be changed into another prime (90931879079) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45465939504 + 45465939505.

It is an arithmetic number, because the mean of its divisors is an integer number (45465939505).

Almost surely, 2^90931879009 is an apocalyptic number.

It is an amenable number.

90931879009 is a deficient number, since it is larger than the sum of its proper divisors (1).

90931879009 is an equidigital number, since it uses as much as digits as its factorization.

90931879009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1102248, while the sum is 55.

The spelling of 90931879009 in words is "ninety billion, nine hundred thirty-one million, eight hundred seventy-nine thousand, nine".