91675917591 has 4 divisors (see below), whose sum is σ = 122234556792. Its totient is φ = 61117278392.

The previous prime is 91675917583. The next prime is 91675917601. The reversal of 91675917591 is 19571957619.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 91675917591 - 2³ = 91675917583 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91675917581) 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, 15279319596 + ... + 15279319601.

It is an arithmetic number, because the mean of its divisors is an integer number (30558639198).

Almost surely, 2^91675917591 is an apocalyptic number.

91675917591 is a deficient number, since it is larger than the sum of its proper divisors (30558639201).

91675917591 is a wasteful number, since it uses less digits than its factorization.

91675917591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30558639200.

The product of its digits is 5358150, while the sum is 60.

The spelling of 91675917591 in words is "ninety-one billion, six hundred seventy-five million, nine hundred seventeen thousand, five hundred ninety-one".