91521925 has 48 divisors (see below), whose sum is σ = 129491712. Its totient is φ = 63590400.

The previous prime is 91521923. The next prime is 91521929. The reversal of 91521925 is 52912519.

It is not a de Polignac number, because 91521925 - 2¹ = 91521923 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91521923) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 943477 + ... + 943573.

It is an arithmetic number, because the mean of its divisors is an integer number (2697744).

Almost surely, 2^91521925 is an apocalyptic number.

It is an amenable number.

91521925 is a deficient number, since it is larger than the sum of its proper divisors (37969787).

91521925 is a wasteful number, since it uses less digits than its factorization.

91521925 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 238 (or 233 counting only the distinct ones).

The product of its digits is 8100, while the sum is 34.

The square root of 91521925 is about 9566.7092043189. The cubic root of 91521925 is about 450.6524281119.

The spelling of 91521925 in words is "ninety-one million, five hundred twenty-one thousand, nine hundred twenty-five".