91110233657 has 2 divisors, whose sum is σ = 91110233658. Its totient is φ = 91110233656.

The previous prime is 91110233561. The next prime is 91110233719. The reversal of 91110233657 is 75633201119.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 84783462976 + 6326770681 = 291176^2 + 79541^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91110233657 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 91110233657.

It is not a weakly prime, because it can be changed into another prime (91110233257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45555116828 + 45555116829.

It is an arithmetic number, because the mean of its divisors is an integer number (45555116829).

Almost surely, 2^91110233657 is an apocalyptic number.

It is an amenable number.

91110233657 is a deficient number, since it is larger than the sum of its proper divisors (1).

91110233657 is an equidigital number, since it uses as much as digits as its factorization.

91110233657 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 34020, while the sum is 38.

The spelling of 91110233657 in words is "ninety-one billion, one hundred ten million, two hundred thirty-three thousand, six hundred fifty-seven".