91331222722 has 32 divisors (see below), whose sum is σ = 146738995200. Its totient is φ = 42483087360.

The previous prime is 91331222713. The next prime is 91331222753. The reversal of 91331222722 is 22722213319.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1131154 + ... + 1209202.

It is an arithmetic number, because the mean of its divisors is an integer number (4585593600).

Almost surely, 2^91331222722 is an apocalyptic number.

91331222722 is a deficient number, since it is larger than the sum of its proper divisors (55407772478).

91331222722 is a wasteful number, since it uses less digits than its factorization.

91331222722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78466.

The product of its digits is 18144, while the sum is 34.

The spelling of 91331222722 in words is "ninety-one billion, three hundred thirty-one million, two hundred twenty-two thousand, seven hundred twenty-two".