91908136322 has 10 divisors (see below), whose sum is σ = 138160607523. Its totient is φ = 45854815314.

The previous prime is 91908136319. The next prime is 91908136339. The reversal of 91908136322 is 22363180919.

It can be written as a sum of positive squares in only one way, i.e., 45954068161 + 45954068161 = 214369^2 + 214369^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=214369.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 4 ways as a sum of consecutive naturals, for example, 198505463 + ... + 198505925.

Almost surely, 2^91908136322 is an apocalyptic number.

91908136322 is a deficient number, since it is larger than the sum of its proper divisors (46252471201).

91908136322 is an frugal number, since it uses more digits than its factorization.

91908136322 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1854 (or 465 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 44.

The spelling of 91908136322 in words is "ninety-one billion, nine hundred eight million, one hundred thirty-six thousand, three hundred twenty-two".