91251867 has 24 divisors (see below), whose sum is σ = 142505472. Its totient is φ = 51786000.

The previous prime is 91251841. The next prime is 91251883. The reversal of 91251867 is 76815219.

It is not a de Polignac number, because 91251867 - 2⁷ = 91251739 is a prime.

It is not an unprimeable number, because it can be changed into a prime (91251467) 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 23 ways as a sum of consecutive naturals, for example, 20142 + ... + 24252.

It is an arithmetic number, because the mean of its divisors is an integer number (5937728).

Almost surely, 2^91251867 is an apocalyptic number.

91251867 is a deficient number, since it is larger than the sum of its proper divisors (51253605).

91251867 is a wasteful number, since it uses less digits than its factorization.

91251867 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4279 (or 4272 counting only the distinct ones).

The product of its digits is 30240, while the sum is 39.

The square root of 91251867 is about 9552.5843100179. The cubic root of 91251867 is about 450.2087377275.

The spelling of 91251867 in words is "ninety-one million, two hundred fifty-one thousand, eight hundred sixty-seven".