91315743994 has 4 divisors (see below), whose sum is σ = 136973615994. Its totient is φ = 45657871996.

The previous prime is 91315743941. The next prime is 91315744033. The reversal of 91315743994 is 49934751319.

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., 56789273025 + 34526470969 = 238305^2 + 185813^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22828935997 + ... + 22828936000.

Almost surely, 2^91315743994 is an apocalyptic number.

91315743994 is a deficient number, since it is larger than the sum of its proper divisors (45657872000).

91315743994 is a wasteful number, since it uses less digits than its factorization.

91315743994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45657871999.

The product of its digits is 3674160, while the sum is 55.

The spelling of 91315743994 in words is "ninety-one billion, three hundred fifteen million, seven hundred forty-three thousand, nine hundred ninety-four".