91038087 has 40 divisors (see below), whose sum is σ = 156227456. Its totient is φ = 51753168.

The previous prime is 91038053. The next prime is 91038109. The reversal of 91038087 is 78083019.

It is not a de Polignac number, because 91038087 - 2⁶ = 91038023 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91038287) 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 39 ways as a sum of consecutive naturals, for example, 173808 + ... + 174330.

Almost surely, 2^91038087 is an apocalyptic number.

91038087 is a deficient number, since it is larger than the sum of its proper divisors (65189369).

91038087 is a wasteful number, since it uses less digits than its factorization.

91038087 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 849 (or 840 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 36.

The square root of 91038087 is about 9541.3881065598. The cubic root of 91038087 is about 449.8568878246.

The spelling of 91038087 in words is "ninety-one million, thirty-eight thousand, eighty-seven".