91389025 has 72 divisors (see below), whose sum is σ = 149226560. Its totient is φ = 54051840.

The previous prime is 91389019. The next prime is 91389037. The reversal of 91389025 is 52098319.

It is not a de Polignac number, because 91389025 - 2⁷ = 91388897 is a prime.

It is a hoax number, since the sum of its digits (37) 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 71 ways as a sum of consecutive naturals, for example, 657406 + ... + 657544.

Almost surely, 2^91389025 is an apocalyptic number.

It is an amenable number.

91389025 is a deficient number, since it is larger than the sum of its proper divisors (57837535).

91389025 is a wasteful number, since it uses less digits than its factorization.

91389025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 203 (or 181 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 37.

The square root of 91389025 is about 9559.7607187628. The cubic root of 91389025 is about 450.4341899833.

The spelling of 91389025 in words is "ninety-one million, three hundred eighty-nine thousand, twenty-five".