91389186657 has 32 divisors (see below), whose sum is σ = 136468617600. Its totient is φ = 60442039296.

The previous prime is 91389186643. The next prime is 91389186659. The reversal of 91389186657 is 75668198319.

It is not a de Polignac number, because 91389186657 - 2²² = 91384992353 is a prime.

It is a super-3 number, since 3×91389186657³ (a number of 34 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 91389186594 and 91389186603.

It is not an unprimeable number, because it can be changed into a prime (91389186659) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5369553 + ... + 5386545.

It is an arithmetic number, because the mean of its divisors is an integer number (4264644300).

Almost surely, 2^91389186657 is an apocalyptic number.

It is an amenable number.

91389186657 is a deficient number, since it is larger than the sum of its proper divisors (45079430943).

91389186657 is a wasteful number, since it uses less digits than its factorization.

91389186657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18574 (or 18568 counting only the distinct ones).

The product of its digits is 19595520, while the sum is 63.

The spelling of 91389186657 in words is "ninety-one billion, three hundred eighty-nine million, one hundred eighty-six thousand, six hundred fifty-seven".