99913172591 has 2 divisors, whose sum is σ = 99913172592. Its totient is φ = 99913172590.

The previous prime is 99913172573. The next prime is 99913172603. The reversal of 99913172591 is 19527131999.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 99913172591 - 2²² = 99908978287 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99913172561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49956586295 + 49956586296.

It is an arithmetic number, because the mean of its divisors is an integer number (49956586296).

Almost surely, 2^99913172591 is an apocalyptic number.

99913172591 is a deficient number, since it is larger than the sum of its proper divisors (1).

99913172591 is an equidigital number, since it uses as much as digits as its factorization.

99913172591 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1377810, while the sum is 56.

The spelling of 99913172591 in words is "ninety-nine billion, nine hundred thirteen million, one hundred seventy-two thousand, five hundred ninety-one".