90090840761 has 2 divisors, whose sum is σ = 90090840762. Its totient is φ = 90090840760.

The previous prime is 90090840713. The next prime is 90090840767. The reversal of 90090840761 is 16704809009.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 78156589225 + 11934251536 = 279565^2 + 109244^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90090840761 is a prime.

It is not a weakly prime, because it can be changed into another prime (90090840767) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45045420380 + 45045420381.

It is an arithmetic number, because the mean of its divisors is an integer number (45045420381).

Almost surely, 2^90090840761 is an apocalyptic number.

It is an amenable number.

90090840761 is a deficient number, since it is larger than the sum of its proper divisors (1).

90090840761 is an equidigital number, since it uses as much as digits as its factorization.

90090840761 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108864, while the sum is 44.

The spelling of 90090840761 in words is "ninety billion, ninety million, eight hundred forty thousand, seven hundred sixty-one".