91020722 has 16 divisors (see below), whose sum is σ = 149107392. Its totient is φ = 41417040.

The previous prime is 91020701. The next prime is 91020733. The reversal of 91020722 is 22702019.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22808 + ... + 26499.

It is an arithmetic number, because the mean of its divisors is an integer number (9319212).

Almost surely, 2^91020722 is an apocalyptic number.

91020722 is a deficient number, since it is larger than the sum of its proper divisors (58086670).

91020722 is a wasteful number, since it uses less digits than its factorization.

91020722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49393.

The product of its (nonzero) digits is 504, while the sum is 23.

The square root of 91020722 is about 9540.4780802641. The cubic root of 91020722 is about 449.8282834538.

The spelling of 91020722 in words is "ninety-one million, twenty thousand, seven hundred twenty-two".