91039136 has 12 divisors (see below), whose sum is σ = 179233362. Its totient is φ = 45519552.

The previous prime is 91039099. The next prime is 91039153. The reversal of 91039136 is 63193019.

It can be written as a sum of positive squares in only one way, i.e., 89491600 + 1547536 = 9460^2 + 1244^2 .

It is a Harshad number since it is a multiple of its sum of digits (32), and also a Moran number because the ratio is a prime number: 2844973 = 91039136 / (9 + 1 + 0 + 3 + 9 + 1 + 3 + 6).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1422455 + ... + 1422518.

Almost surely, 2^91039136 is an apocalyptic number.

It is an amenable number.

91039136 is a deficient number, since it is larger than the sum of its proper divisors (88194226).

91039136 is a wasteful number, since it uses less digits than its factorization.

91039136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2844983 (or 2844975 counting only the distinct ones).

The product of its (nonzero) digits is 4374, while the sum is 32.

The square root of 91039136 is about 9541.4430774385. The cubic root of 91039136 is about 449.8586156658.

The spelling of 91039136 in words is "ninety-one million, thirty-nine thousand, one hundred thirty-six".