91625968937 has 2 divisors, whose sum is σ = 91625968938. Its totient is φ = 91625968936.

The previous prime is 91625968933. The next prime is 91625969003. The reversal of 91625968937 is 73986952619.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 81154335376 + 10471633561 = 284876^2 + 102331^2 .

It is an emirp because it is prime and its reverse (73986952619) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91625968937 - 2² = 91625968933 is a prime.

It is not a weakly prime, because it can be changed into another prime (91625968933) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45812984468 + 45812984469.

It is an arithmetic number, because the mean of its divisors is an integer number (45812984469).

Almost surely, 2^91625968937 is an apocalyptic number.

It is an amenable number.

91625968937 is a deficient number, since it is larger than the sum of its proper divisors (1).

91625968937 is an equidigital number, since it uses as much as digits as its factorization.

91625968937 is an evil number, because the sum of its binary digits is even.

The product of its digits is 44089920, while the sum is 65.

The spelling of 91625968937 in words is "ninety-one billion, six hundred twenty-five million, nine hundred sixty-eight thousand, nine hundred thirty-seven".