91730323457 has 2 divisors, whose sum is σ = 91730323458. Its totient is φ = 91730323456.

The previous prime is 91730323441. The next prime is 91730323469. The reversal of 91730323457 is 75432303719.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 85637584321 + 6092739136 = 292639^2 + 78056^2 .

It is an emirp because it is prime and its reverse (75432303719) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91730323457 - 2⁴ = 91730323441 is a prime.

It is not a weakly prime, because it can be changed into another prime (91730323417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45865161728 + 45865161729.

It is an arithmetic number, because the mean of its divisors is an integer number (45865161729).

Almost surely, 2^91730323457 is an apocalyptic number.

It is an amenable number.

91730323457 is a deficient number, since it is larger than the sum of its proper divisors (1).

91730323457 is an equidigital number, since it uses as much as digits as its factorization.

91730323457 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 476280, while the sum is 44.

The spelling of 91730323457 in words is "ninety-one billion, seven hundred thirty million, three hundred twenty-three thousand, four hundred fifty-seven".