91131375 has 32 divisors (see below), whose sum is σ = 153766080. Its totient is φ = 47923200.

The previous prime is 91131361. The next prime is 91131379. The reversal of 91131375 is 57313119.

It is a happy number.

It is not a de Polignac number, because 91131375 - 2⁵ = 91131343 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91131379) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 25711 + ... + 29039.

It is an arithmetic number, because the mean of its divisors is an integer number (4805190).

Almost surely, 2^91131375 is an apocalyptic number.

91131375 is a deficient number, since it is larger than the sum of its proper divisors (62634705).

91131375 is a wasteful number, since it uses less digits than its factorization.

91131375 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3420 (or 3410 counting only the distinct ones).

The product of its digits is 2835, while the sum is 30.

The square root of 91131375 is about 9546.2754517141. The cubic root of 91131375 is about 450.0104935825.

The spelling of 91131375 in words is "ninety-one million, one hundred thirty-one thousand, three hundred seventy-five".