91576918793889 has 39 divisors (see below), whose sum is σ = 137375757161377. Its totient is φ = 61046628378588.

The previous prime is 91576918793863. The next prime is 91576918793917. The reversal of 91576918793889 is 98839781967519.

The square root of 91576918793889 is 9569583.

It is a perfect power (a square), and thus also a powerful number.

91576918793889 is a `hidden beast` number, since 9 + 1 + 5 + 76 + 91 + 8 + 79 + 388 + 9 = 666.

It is not a de Polignac number, because 91576918793889 - 2⁷ = 91576918793761 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 91576918793799 and 91576918793808.

It is not an unprimeable number, because it can be changed into a prime (91576918793849) by changing a digit.

It is a polite number, since it can be written in 38 ways as a sum of consecutive naturals, for example, 6976219444 + ... + 6976232570.

Almost surely, 2^{91576918793889} is an apocalyptic number.

91576918793889 is the 9569583-rd square number.

91576918793889 is the 4784792-nd centered octagonal number.

It is an amenable number.

91576918793889 is a deficient number, since it is larger than the sum of its proper divisors (45798838367488).

91576918793889 is an frugal number, since it uses more digits than its factorization.

91576918793889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26290 (or 13130 counting only the distinct ones).

The product of its digits is 14814213120, while the sum is 90.

The spelling of 91576918793889 in words is "ninety-one trillion, five hundred seventy-six billion, nine hundred eighteen million, seven hundred ninety-three thousand, eight hundred eighty-nine".