91045555057 has 2 divisors, whose sum is σ = 91045555058. Its totient is φ = 91045555056.

The previous prime is 91045555019. The next prime is 91045555067. The reversal of 91045555057 is 75055554019.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 71422028001 + 19623527056 = 267249^2 + 140084^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91045555057 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 91045554998 and 91045555016.

It is not a weakly prime, because it can be changed into another prime (91045555067) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45522777528 + 45522777529.

It is an arithmetic number, because the mean of its divisors is an integer number (45522777529).

Almost surely, 2^91045555057 is an apocalyptic number.

It is an amenable number.

91045555057 is a deficient number, since it is larger than the sum of its proper divisors (1).

91045555057 is an equidigital number, since it uses as much as digits as its factorization.

91045555057 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 787500, while the sum is 46.

The spelling of 91045555057 in words is "ninety-one billion, forty-five million, five hundred fifty-five thousand, fifty-seven".