91059731487 has 12 divisors (see below), whose sum is σ = 131539443360. Its totient is φ = 60702463008.

The previous prime is 91059731471. The next prime is 91059731513. The reversal of 91059731487 is 78413795019.

It is a happy number.

91059731487 is a `hidden beast` number, since 9 + 1 + 0 + 597 + 3 + 1 + 48 + 7 = 666.

It is not a de Polignac number, because 91059731487 - 2⁴ = 91059731471 is a prime.

It is a hoax number, since the sum of its digits (54) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91059731407) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 188718 + ... + 466619.

It is an arithmetic number, because the mean of its divisors is an integer number (10961620280).

Almost surely, 2^91059731487 is an apocalyptic number.

91059731487 is a deficient number, since it is larger than the sum of its proper divisors (40479711873).

91059731487 is a wasteful number, since it uses less digits than its factorization.

91059731487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 670782 (or 670779 counting only the distinct ones).

The product of its (nonzero) digits is 1905120, while the sum is 54.

The spelling of 91059731487 in words is "ninety-one billion, fifty-nine million, seven hundred thirty-one thousand, four hundred eighty-seven".