91909555601 has 2 divisors, whose sum is σ = 91909555602. Its totient is φ = 91909555600.

The previous prime is 91909555579. The next prime is 91909555603. The reversal of 91909555601 is 10655590919.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 90480640000 + 1428915601 = 300800^2 + 37801^2 .

It is a cyclic number.

It is not a de Polignac number, because 91909555601 - 2¹⁸ = 91909293457 is a prime.

Together with 91909555603, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 91909555601.

It is not a weakly prime, because it can be changed into another prime (91909555603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45954777800 + 45954777801.

It is an arithmetic number, because the mean of its divisors is an integer number (45954777801).

Almost surely, 2^91909555601 is an apocalyptic number.

It is an amenable number.

91909555601 is a deficient number, since it is larger than the sum of its proper divisors (1).

91909555601 is an equidigital number, since it uses as much as digits as its factorization.

91909555601 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 546750, while the sum is 50.

The spelling of 91909555601 in words is "ninety-one billion, nine hundred nine million, five hundred fifty-five thousand, six hundred one".