91185287 has 2 divisors, whose sum is σ = 91185288. Its totient is φ = 91185286.

The previous prime is 91185277. The next prime is 91185299. The reversal of 91185287 is 78258119.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 91185287 - 2⁶ = 91185223 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91185257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45592643 + 45592644.

It is an arithmetic number, because the mean of its divisors is an integer number (45592644).

Almost surely, 2^91185287 is an apocalyptic number.

91185287 is a deficient number, since it is larger than the sum of its proper divisors (1).

91185287 is an equidigital number, since it uses as much as digits as its factorization.

91185287 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40320, while the sum is 41.

The square root of 91185287 is about 9549.0987532856. The cubic root of 91185287 is about 450.0992159833.

The spelling of 91185287 in words is "ninety-one million, one hundred eighty-five thousand, two hundred eighty-seven".