91625968481 has 2 divisors, whose sum is σ = 91625968482. Its totient is φ = 91625968480.

The previous prime is 91625968453. The next prime is 91625968559. The reversal of 91625968481 is 18486952619.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 56826931456 + 34799037025 = 238384^2 + 186545^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91625968481 is a prime.

It is a super-2 number, since 2×91625968481² (a number of 23 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 91625968481.

It is not a weakly prime, because it can be changed into another prime (91625964481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45812984240 + 45812984241.

It is an arithmetic number, because the mean of its divisors is an integer number (45812984241).

Almost surely, 2^91625968481 is an apocalyptic number.

It is an amenable number.

91625968481 is a deficient number, since it is larger than the sum of its proper divisors (1).

91625968481 is an equidigital number, since it uses as much as digits as its factorization.

91625968481 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7464960, while the sum is 59.

The spelling of 91625968481 in words is "ninety-one billion, six hundred twenty-five million, nine hundred sixty-eight thousand, four hundred eighty-one".