91851936937 has 2 divisors, whose sum is σ = 91851936938. Its totient is φ = 91851936936.

The previous prime is 91851936931. The next prime is 91851936941. The reversal of 91851936937 is 73963915819.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 77237303056 + 14614633881 = 277916^2 + 120891^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91851936937 is a prime.

It is not a weakly prime, because it can be changed into another prime (91851936931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45925968468 + 45925968469.

It is an arithmetic number, because the mean of its divisors is an integer number (45925968469).

Almost surely, 2^91851936937 is an apocalyptic number.

It is an amenable number.

91851936937 is a deficient number, since it is larger than the sum of its proper divisors (1).

91851936937 is an equidigital number, since it uses as much as digits as its factorization.

91851936937 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11022480, while the sum is 61.

The spelling of 91851936937 in words is "ninety-one billion, eight hundred fifty-one million, nine hundred thirty-six thousand, nine hundred thirty-seven".