90924817957 has 2 divisors, whose sum is σ = 90924817958. Its totient is φ = 90924817956.

The previous prime is 90924817943. The next prime is 90924817987. The reversal of 90924817957 is 75971842909.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 72035339236 + 18889478721 = 268394^2 + 137439^2 .

It is a cyclic number.

It is not a de Polignac number, because 90924817957 - 2²³ = 90916429349 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 90924817895 and 90924817904.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90924817987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45462408978 + 45462408979.

It is an arithmetic number, because the mean of its divisors is an integer number (45462408979).

Almost surely, 2^90924817957 is an apocalyptic number.

It is an amenable number.

90924817957 is a deficient number, since it is larger than the sum of its proper divisors (1).

90924817957 is an equidigital number, since it uses as much as digits as its factorization.

90924817957 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11430720, while the sum is 61.

The spelling of 90924817957 in words is "ninety billion, nine hundred twenty-four million, eight hundred seventeen thousand, nine hundred fifty-seven".