90909090977 has 2 divisors, whose sum is σ = 90909090978. Its totient is φ = 90909090976.

The previous prime is 90909090967. The next prime is 90909091027. The reversal of 90909090977 is 77909090909.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 82635551296 + 8273539681 = 287464^2 + 90959^2 .

It is a cyclic number.

It is not a de Polignac number, because 90909090977 - 2¹⁸ = 90908828833 is a prime.

It is not a weakly prime, because it can be changed into another prime (90909090967) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45454545488 + 45454545489.

It is an arithmetic number, because the mean of its divisors is an integer number (45454545489).

Almost surely, 2^90909090977 is an apocalyptic number.

It is an amenable number.

90909090977 is a deficient number, since it is larger than the sum of its proper divisors (1).

90909090977 is an equidigital number, since it uses as much as digits as its factorization.

90909090977 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2893401, while the sum is 59.

The spelling of 90909090977 in words is "ninety billion, nine hundred nine million, ninety thousand, nine hundred seventy-seven".