91905674797 has 4 divisors (see below), whose sum is σ = 94870374016. Its totient is φ = 88940975580.

The previous prime is 91905674761. The next prime is 91905674807. The reversal of 91905674797 is 79747650919.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 91905674797 - 2²⁷ = 91771457069 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91905672797) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1482349563 + ... + 1482349624.

It is an arithmetic number, because the mean of its divisors is an integer number (23717593504).

Almost surely, 2^91905674797 is an apocalyptic number.

It is an amenable number.

91905674797 is a deficient number, since it is larger than the sum of its proper divisors (2964699219).

91905674797 is a wasteful number, since it uses less digits than its factorization.

91905674797 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2964699218.

The product of its (nonzero) digits is 30005640, while the sum is 64.

The spelling of 91905674797 in words is "ninety-one billion, nine hundred five million, six hundred seventy-four thousand, seven hundred ninety-seven".