91975623361 has 2 divisors, whose sum is σ = 91975623362. Its totient is φ = 91975623360.

The previous prime is 91975623353. The next prime is 91975623373. The reversal of 91975623361 is 16332657919.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 73627566336 + 18348057025 = 271344^2 + 135455^2 .

It is a cyclic number.

It is not a de Polignac number, because 91975623361 - 2³ = 91975623353 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 91975623299 and 91975623308.

It is not a weakly prime, because it can be changed into another prime (91975623461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45987811680 + 45987811681.

It is an arithmetic number, because the mean of its divisors is an integer number (45987811681).

Almost surely, 2^91975623361 is an apocalyptic number.

It is an amenable number.

91975623361 is a deficient number, since it is larger than the sum of its proper divisors (1).

91975623361 is an equidigital number, since it uses as much as digits as its factorization.

91975623361 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1837080, while the sum is 52.

The spelling of 91975623361 in words is "ninety-one billion, nine hundred seventy-five million, six hundred twenty-three thousand, three hundred sixty-one".