91687542489 has 40 divisors (see below), whose sum is σ = 144292500000. Its totient is φ = 57860345088.

The previous prime is 91687542473. The next prime is 91687542497. The reversal of 91687542489 is 98424578619.

91687542489 is a `hidden beast` number, since 9 + 1 + 6 + 8 + 7 + 542 + 4 + 89 = 666.

It is not a de Polignac number, because 91687542489 - 2⁴ = 91687542473 is a prime.

It is not an unprimeable number, because it can be changed into a prime (91687542469) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 1898362 + ... + 1946060.

It is an arithmetic number, because the mean of its divisors is an integer number (3607312500).

Almost surely, 2^91687542489 is an apocalyptic number.

It is an amenable number.

91687542489 is a deficient number, since it is larger than the sum of its proper divisors (52604957511).

91687542489 is a wasteful number, since it uses less digits than its factorization.

91687542489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48979 (or 48970 counting only the distinct ones).

The product of its digits is 34836480, while the sum is 63.

The spelling of 91687542489 in words is "ninety-one billion, six hundred eighty-seven million, five hundred forty-two thousand, four hundred eighty-nine".