91375251 has 32 divisors (see below), whose sum is σ = 139898880. Its totient is φ = 52509600.

The previous prime is 91375241. The next prime is 91375279. The reversal of 91375251 is 15257319.

It is not a de Polignac number, because 91375251 - 2¹⁸ = 91113107 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (91375231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 98970 + ... + 99888.

It is an arithmetic number, because the mean of its divisors is an integer number (4371840).

Almost surely, 2^91375251 is an apocalyptic number.

91375251 is a deficient number, since it is larger than the sum of its proper divisors (48523629).

91375251 is a wasteful number, since it uses less digits than its factorization.

91375251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1087.

The product of its digits is 9450, while the sum is 33.

The square root of 91375251 is about 9559.0402760947. The cubic root of 91375251 is about 450.4115592854.

The spelling of 91375251 in words is "ninety-one million, three hundred seventy-five thousand, two hundred fifty-one".