91267597531 has 4 divisors (see below), whose sum is σ = 99564651864. Its totient is φ = 82970543200.

The previous prime is 91267597441. The next prime is 91267597541. The reversal of 91267597531 is 13579576219.

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 91267597531 - 2¹⁹ = 91267073243 is a prime.

It is a super-2 number, since 2×91267597531² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91267597541) 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, 4148527150 + ... + 4148527171.

It is an arithmetic number, because the mean of its divisors is an integer number (24891162966).

Almost surely, 2^91267597531 is an apocalyptic number.

91267597531 is a deficient number, since it is larger than the sum of its proper divisors (8297054333).

91267597531 is a wasteful number, since it uses less digits than its factorization.

91267597531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8297054332.

The product of its digits is 3572100, while the sum is 55.

The spelling of 91267597531 in words is "ninety-one billion, two hundred sixty-seven million, five hundred ninety-seven thousand, five hundred thirty-one".