91037090 has 16 divisors (see below), whose sum is σ = 169517880. Its totient is φ = 35159040.

The previous prime is 91037087. The next prime is 91037101. The reversal of 91037090 is 9073019.

It can be written as a sum of positive squares in 4 ways, for example, as 61952641 + 29084449 = 7871^2 + 5393^2 .

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 156671 + ... + 157250.

Almost surely, 2^91037090 is an apocalyptic number.

91037090 is a deficient number, since it is larger than the sum of its proper divisors (78480790).

91037090 is a wasteful number, since it uses less digits than its factorization.

91037090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 313957.

The product of its (nonzero) digits is 1701, while the sum is 29.

The square root of 91037090 is about 9541.3358603500. The cubic root of 91037090 is about 449.8552456220.

The spelling of 91037090 in words is "ninety-one million, thirty-seven thousand, ninety".