91064531 has 4 divisors (see below), whose sum is σ = 91085064. Its totient is φ = 91044000.

The previous prime is 91064509. The next prime is 91064537. The reversal of 91064531 is 13546019.

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-91064531 is a prime.

It is a super-2 number, since 2×91064531² = 16585497612499922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 91064494 and 91064503.

It is not an unprimeable number, because it can be changed into a prime (91064537) 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, 545 + ... + 13506.

It is an arithmetic number, because the mean of its divisors is an integer number (22771266).

Almost surely, 2^91064531 is an apocalyptic number.

91064531 is a deficient number, since it is larger than the sum of its proper divisors (20533).

91064531 is a wasteful number, since it uses less digits than its factorization.

91064531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20532.

The product of its (nonzero) digits is 3240, while the sum is 29.

The square root of 91064531 is about 9542.7737581900. The cubic root of 91064531 is about 449.9004405262.

The spelling of 91064531 in words is "ninety-one million, sixty-four thousand, five hundred thirty-one".