91495689639797 has 2 divisors, whose sum is σ = 91495689639798. Its totient is φ = 91495689639796.

The previous prime is 91495689639763. The next prime is 91495689639821. The reversal of 91495689639797 is 79793698659419.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 90643328621041 + 852361018756 = 9520679^2 + 923234^2 .

It is a cyclic number.

It is not a de Polignac number, because 91495689639797 - 2⁴² = 87097643128693 is a prime.

It is a super-2 number, since 2×91495689639797² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91495689632797) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45747844819898 + 45747844819899.

It is an arithmetic number, because the mean of its divisors is an integer number (45747844819899).

Almost surely, 2^{91495689639797} is an apocalyptic number.

It is an amenable number.

91495689639797 is a deficient number, since it is larger than the sum of its proper divisors (1).

91495689639797 is an equidigital number, since it uses as much as digits as its factorization.

91495689639797 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 49997969280, while the sum is 92.

The spelling of 91495689639797 in words is "ninety-one trillion, four hundred ninety-five billion, six hundred eighty-nine million, six hundred thirty-nine thousand, seven hundred ninety-seven".