90909877 has 2 divisors, whose sum is σ = 90909878. Its totient is φ = 90909876.

The previous prime is 90909859. The next prime is 90909881. The reversal of 90909877 is 77890909.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 63776196 + 27133681 = 7986^2 + 5209^2 .

It is an emirp because it is prime and its reverse (77890909) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 90909877 - 2¹¹ = 90907829 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 90909877.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90909857) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45454938 + 45454939.

It is an arithmetic number, because the mean of its divisors is an integer number (45454939).

Almost surely, 2^90909877 is an apocalyptic number.

It is an amenable number.

90909877 is a deficient number, since it is larger than the sum of its proper divisors (1).

90909877 is an equidigital number, since it uses as much as digits as its factorization.

90909877 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 285768, while the sum is 49.

The square root of 90909877 is about 9534.6671153219. The cubic root of 90909877 is about 449.6456090437.

The spelling of 90909877 in words is "ninety million, nine hundred nine thousand, eight hundred seventy-seven".