91521004 has 12 divisors (see below), whose sum is σ = 160303528. Its totient is φ = 45720000.

The previous prime is 91520999. The next prime is 91521011. The reversal of 91521004 is 40012519.

It is a hoax number, since the sum of its digits (22) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4722 + ... + 14329.

Almost surely, 2^91521004 is an apocalyptic number.

It is an amenable number.

91521004 is a deficient number, since it is larger than the sum of its proper divisors (68782524).

91521004 is a wasteful number, since it uses less digits than its factorization.

91521004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20256 (or 20254 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 22.

The square root of 91521004 is about 9566.6610685233. The cubic root of 91521004 is about 450.6509164440.

The spelling of 91521004 in words is "ninety-one million, five hundred twenty-one thousand, four".