91131826922 has 4 divisors (see below), whose sum is σ = 136697740386. Its totient is φ = 45565913460.

The previous prime is 91131826909. The next prime is 91131827009. The reversal of 91131826922 is 22962813119.

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., 77791345921 + 13340481001 = 278911^2 + 115501^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22782956729 + ... + 22782956732.

Almost surely, 2^91131826922 is an apocalyptic number.

91131826922 is a deficient number, since it is larger than the sum of its proper divisors (45565913464).

91131826922 is a wasteful number, since it uses less digits than its factorization.

91131826922 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45565913463.

The product of its digits is 93312, while the sum is 44.

The spelling of 91131826922 in words is "ninety-one billion, one hundred thirty-one million, eight hundred twenty-six thousand, nine hundred twenty-two".