91814411057 has 2 divisors, whose sum is σ = 91814411058. Its totient is φ = 91814411056.

The previous prime is 91814411033. The next prime is 91814411063. The reversal of 91814411057 is 75011441819.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 90407861041 + 1406550016 = 300679^2 + 37504^2 .

It is a cyclic number.

It is not a de Polignac number, because 91814411057 - 2⁶ = 91814410993 is a prime.

It is not a weakly prime, because it can be changed into another prime (91814411357) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45907205528 + 45907205529.

It is an arithmetic number, because the mean of its divisors is an integer number (45907205529).

Almost surely, 2^91814411057 is an apocalyptic number.

It is an amenable number.

91814411057 is a deficient number, since it is larger than the sum of its proper divisors (1).

91814411057 is an equidigital number, since it uses as much as digits as its factorization.

91814411057 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40320, while the sum is 41.

The spelling of 91814411057 in words is "ninety-one billion, eight hundred fourteen million, four hundred eleven thousand, fifty-seven".