91572615791 has 2 divisors, whose sum is σ = 91572615792. Its totient is φ = 91572615790.

The previous prime is 91572615781. The next prime is 91572615809. The reversal of 91572615791 is 19751627519.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 91572615791 - 2⁶ = 91572615727 is a prime.

It is a super-2 number, since 2×91572615791² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91572615751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45786307895 + 45786307896.

It is an arithmetic number, because the mean of its divisors is an integer number (45786307896).

Almost surely, 2^91572615791 is an apocalyptic number.

91572615791 is a deficient number, since it is larger than the sum of its proper divisors (1).

91572615791 is an equidigital number, since it uses as much as digits as its factorization.

91572615791 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1190700, while the sum is 53.

The spelling of 91572615791 in words is "ninety-one billion, five hundred seventy-two million, six hundred fifteen thousand, seven hundred ninety-one".