91507887 has 20 divisors (see below), whose sum is σ = 136993296. Its totient is φ = 60873120.

The previous prime is 91507883. The next prime is 91507901. The reversal of 91507887 is 78870519.

It is not a de Polignac number, because 91507887 - 2² = 91507883 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91507883) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 49062 + ... + 50892.

Almost surely, 2^91507887 is an apocalyptic number.

91507887 is a deficient number, since it is larger than the sum of its proper divisors (45485409).

91507887 is a wasteful number, since it uses less digits than its factorization.

91507887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2460 (or 2451 counting only the distinct ones).

The product of its (nonzero) digits is 141120, while the sum is 45.

The square root of 91507887 is about 9565.9754860652. The cubic root of 91507887 is about 450.6293859747.

The spelling of 91507887 in words is "ninety-one million, five hundred seven thousand, eight hundred eighty-seven".