91500550369 has 2 divisors, whose sum is σ = 91500550370. Its totient is φ = 91500550368.

The previous prime is 91500550357. The next prime is 91500550391. The reversal of 91500550369 is 96305500519.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 47660565969 + 43839984400 = 218313^2 + 209380^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91500550369 is a prime.

It is a super-2 number, since 2×91500550369² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (91500550969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45750275184 + 45750275185.

It is an arithmetic number, because the mean of its divisors is an integer number (45750275185).

Almost surely, 2^91500550369 is an apocalyptic number.

It is an amenable number.

91500550369 is a deficient number, since it is larger than the sum of its proper divisors (1).

91500550369 is an equidigital number, since it uses as much as digits as its factorization.

91500550369 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 182250, while the sum is 43.

The spelling of 91500550369 in words is "ninety-one billion, five hundred million, five hundred fifty thousand, three hundred sixty-nine".