91171372 has 48 divisors (see below), whose sum is σ = 171601920. Its totient is φ = 42307200.

The previous prime is 91171369. The next prime is 91171373. The reversal of 91171372 is 27317119.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is not an unprimeable number, because it can be changed into a prime (91171373) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 401523 + ... + 401749.

It is an arithmetic number, because the mean of its divisors is an integer number (3575040).

Almost surely, 2^91171372 is an apocalyptic number.

It is an amenable number.

91171372 is a deficient number, since it is larger than the sum of its proper divisors (80430548).

91171372 is a wasteful number, since it uses less digits than its factorization.

91171372 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 382 (or 380 counting only the distinct ones).

The product of its digits is 2646, while the sum is 31.

The square root of 91171372 is about 9548.3701226963. The cubic root of 91171372 is about 450.0763195658.

The spelling of 91171372 in words is "ninety-one million, one hundred seventy-one thousand, three hundred seventy-two".