91961307522 has 54 divisors (see below), whose sum is σ = 231802731459. Its totient is φ = 26272086120.

The previous prime is 91961307517. The next prime is 91961307527. The reversal of 91961307522 is 22570316919.

It is a happy number.

91961307522 is a `hidden beast` number, since 9 + 1 + 9 + 613 + 0 + 7 + 5 + 22 = 666.

It is an interprime number because it is at equal distance from previous prime (91961307517) and next prime (91961307527).

It can be written as a sum of positive squares in only one way, i.e., 45980653761 + 45980653761 = 214431^2 + 214431^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=214431.

It is a super-3 number, since 3×91961307522³ (a number of 34 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (91961307527) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 9000997 + ... + 9011207.

Almost surely, 2^91961307522 is an apocalyptic number.

91961307522 is an abundant number, since it is smaller than the sum of its proper divisors (139841423937).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

91961307522 is an equidigital number, since it uses as much as digits as its factorization.

91961307522 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20444 (or 10223 counting only the distinct ones).

The product of its (nonzero) digits is 204120, while the sum is 45.

The spelling of 91961307522 in words is "ninety-one billion, nine hundred sixty-one million, three hundred seven thousand, five hundred twenty-two".