91812572 has 6 divisors (see below), whose sum is σ = 160672008. Its totient is φ = 45906284.

The previous prime is 91812551. The next prime is 91812583. The reversal of 91812572 is 27521819.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11476568 + ... + 11476575.

It is an arithmetic number, because the mean of its divisors is an integer number (26778668).

Almost surely, 2^91812572 is an apocalyptic number.

It is an amenable number.

91812572 is a deficient number, since it is larger than the sum of its proper divisors (68859436).

91812572 is a wasteful number, since it uses less digits than its factorization.

91812572 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22953147 (or 22953145 counting only the distinct ones).

The product of its digits is 10080, while the sum is 35.

The square root of 91812572 is about 9581.8877054576. The cubic root of 91812572 is about 451.1289710026.

The spelling of 91812572 in words is "ninety-one million, eight hundred twelve thousand, five hundred seventy-two".