91532417651 has 4 divisors (see below), whose sum is σ = 92821606704. Its totient is φ = 90243228600.

The previous prime is 91532417633. The next prime is 91532417677. The reversal of 91532417651 is 15671423519.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91532417651 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91532411651) 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, 644594420 + ... + 644594561.

It is an arithmetic number, because the mean of its divisors is an integer number (23205401676).

Almost surely, 2^91532417651 is an apocalyptic number.

91532417651 is a deficient number, since it is larger than the sum of its proper divisors (1289189053).

91532417651 is a wasteful number, since it uses less digits than its factorization.

91532417651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1289189052.

The product of its digits is 226800, while the sum is 44.

The spelling of 91532417651 in words is "ninety-one billion, five hundred thirty-two million, four hundred seventeen thousand, six hundred fifty-one".