91589975801 has 2 divisors, whose sum is σ = 91589975802. Its totient is φ = 91589975800.

The previous prime is 91589975777. The next prime is 91589975831. The reversal of 91589975801 is 10857998519.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 89865650176 + 1724325625 = 299776^2 + 41525^2 .

It is an emirp because it is prime and its reverse (10857998519) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91589975801 is a prime.

It is not a weakly prime, because it can be changed into another prime (91589975831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45794987900 + 45794987901.

It is an arithmetic number, because the mean of its divisors is an integer number (45794987901).

Almost surely, 2^91589975801 is an apocalyptic number.

It is an amenable number.

91589975801 is a deficient number, since it is larger than the sum of its proper divisors (1).

91589975801 is an equidigital number, since it uses as much as digits as its factorization.

91589975801 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8164800, while the sum is 62.

The spelling of 91589975801 in words is "ninety-one billion, five hundred eighty-nine million, nine hundred seventy-five thousand, eight hundred one".