91090375 has 8 divisors (see below), whose sum is σ = 113680944. Its totient is φ = 72872200.

The previous prime is 91090339. The next prime is 91090379. The reversal of 91090375 is 57309019.

It is a de Polignac number, because none of the positive numbers 2^k-91090375 is a prime.

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 91090375.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91090379) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 364237 + ... + 364486.

It is an arithmetic number, because the mean of its divisors is an integer number (14210118).

Almost surely, 2^91090375 is an apocalyptic number.

91090375 is a deficient number, since it is larger than the sum of its proper divisors (22590569).

91090375 is an equidigital number, since it uses as much as digits as its factorization.

91090375 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 728738 (or 728728 counting only the distinct ones).

The product of its (nonzero) digits is 8505, while the sum is 34.

The square root of 91090375 is about 9544.1277757582. The cubic root of 91090375 is about 449.9429968947.

The spelling of 91090375 in words is "ninety-one million, ninety thousand, three hundred seventy-five".