90999999999913 has 2 divisors, whose sum is σ = 90999999999914. Its totient is φ = 90999999999912.

The previous prime is 90999999999901. The next prime is 91000000000003. The reversal of 90999999999913 is 31999999999909.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 89651886267024 + 1348113732889 = 9468468^2 + 1161083^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90999999999913 is a prime.

It is not a weakly prime, because it can be changed into another prime (90999999999113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45499999999956 + 45499999999957.

It is an arithmetic number, because the mean of its divisors is an integer number (45499999999957).

Almost surely, 2^{90999999999913} is an apocalyptic number.

It is an amenable number.

90999999999913 is a deficient number, since it is larger than the sum of its proper divisors (1).

90999999999913 is an equidigital number, since it uses as much as digits as its factorization.

90999999999913 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 94143178827, while the sum is 103.

The spelling of 90999999999913 in words is "ninety trillion, nine hundred ninety-nine billion, nine hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred thirteen".