91772225 has 12 divisors (see below), whose sum is σ = 113921280. Its totient is φ = 73338000.

The previous prime is 91772221. The next prime is 91772237. The reversal of 91772225 is 52227719.

It is not a de Polignac number, because 91772225 - 2² = 91772221 is a prime.

It is a hoax number, since the sum of its digits (35) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (91772221) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 34700 + ... + 37250.

It is an arithmetic number, because the mean of its divisors is an integer number (9493440).

Almost surely, 2^91772225 is an apocalyptic number.

It is an amenable number.

91772225 is a deficient number, since it is larger than the sum of its proper divisors (22149055).

91772225 is a wasteful number, since it uses less digits than its factorization.

91772225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4000 (or 3995 counting only the distinct ones).

The product of its digits is 17640, while the sum is 35.

The square root of 91772225 is about 9579.7820956429. The cubic root of 91772225 is about 451.0628785017.

The spelling of 91772225 in words is "ninety-one million, seven hundred seventy-two thousand, two hundred twenty-five".