91389186682 has 4 divisors (see below), whose sum is σ = 137083780026. Its totient is φ = 45694593340.

The previous prime is 91389186661. The next prime is 91389186739. The reversal of 91389186682 is 28668198319.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 55041382881 + 36347803801 = 234609^2 + 190651^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 91389186682.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22847296669 + ... + 22847296672.

Almost surely, 2^91389186682 is an apocalyptic number.

91389186682 is a deficient number, since it is larger than the sum of its proper divisors (45694593344).

91389186682 is a wasteful number, since it uses less digits than its factorization.

91389186682 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45694593343.

The product of its digits is 8957952, while the sum is 61.

The spelling of 91389186682 in words is "ninety-one billion, three hundred eighty-nine million, one hundred eighty-six thousand, six hundred eighty-two".