91510642287 has 6 divisors (see below), whose sum is σ = 132182038872. Its totient is φ = 61007094852.

The previous prime is 91510642273. The next prime is 91510642331. The reversal of 91510642287 is 78224601519.

91510642287 is a `hidden beast` number, since 91 + 510 + 6 + 42 + 2 + 8 + 7 = 666.

It is not a de Polignac number, because 91510642287 - 2⁷ = 91510642159 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91510642217) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5083924563 + ... + 5083924580.

It is an arithmetic number, because the mean of its divisors is an integer number (22030339812).

Almost surely, 2^91510642287 is an apocalyptic number.

91510642287 is a deficient number, since it is larger than the sum of its proper divisors (40671396585).

91510642287 is a wasteful number, since it uses less digits than its factorization.

91510642287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10167849149 (or 10167849146 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 45.

The spelling of 91510642287 in words is "ninety-one billion, five hundred ten million, six hundred forty-two thousand, two hundred eighty-seven".