91551424 has 28 divisors (see below), whose sum is σ = 191236600. Its totient is φ = 43365888.

The previous prime is 91551419. The next prime is 91551433. The reversal of 91551424 is 42415519.

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, 36429 + ... + 38860.

Almost surely, 2^91551424 is an apocalyptic number.

It is an amenable number.

91551424 is an abundant number, since it is smaller than the sum of its proper divisors (99685176).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

91551424 is a wasteful number, since it uses less digits than its factorization.

91551424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75320 (or 75310 counting only the distinct ones).

The product of its digits is 7200, while the sum is 31.

The square root of 91551424 is about 9568.2508328325. The cubic root of 91551424 is about 450.7008404385.

The spelling of 91551424 in words is "ninety-one million, five hundred fifty-one thousand, four hundred twenty-four".