91351621922 has 18 divisors (see below), whose sum is σ = 150624682929. Its totient is φ = 41521327320.

The previous prime is 91351621901. The next prime is 91351621943. The reversal of 91351621922 is 22912615319.

It is an interprime number because it is at equal distance from previous prime (91351621901) and next prime (91351621943).

It can be written as a sum of positive squares in 2 ways, for example, as 52143265801 + 39208356121 = 228349^2 + 198011^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=213719.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 91351621922.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 4692104 + ... + 4711532.

Almost surely, 2^91351621922 is an apocalyptic number.

91351621922 is a deficient number, since it is larger than the sum of its proper divisors (59273061007).

91351621922 is an frugal number, since it uses more digits than its factorization.

91351621922 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38882 (or 19442 counting only the distinct ones).

The product of its digits is 58320, while the sum is 41.

The spelling of 91351621922 in words is "ninety-one billion, three hundred fifty-one million, six hundred twenty-one thousand, nine hundred twenty-two".