90369809 has 2 divisors, whose sum is σ = 90369810. Its totient is φ = 90369808.

The previous prime is 90369803. The next prime is 90369817. The reversal of 90369809 is 90896309.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 68840209 + 21529600 = 8297^2 + 4640^2 .

It is a cyclic number.

It is not a de Polignac number, because 90369809 - 2¹⁶ = 90304273 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 90369809.

It is not a weakly prime, because it can be changed into another prime (90369803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45184904 + 45184905.

It is an arithmetic number, because the mean of its divisors is an integer number (45184905).

Almost surely, 2^90369809 is an apocalyptic number.

It is an amenable number.

90369809 is a deficient number, since it is larger than the sum of its proper divisors (1).

90369809 is an equidigital number, since it uses as much as digits as its factorization.

90369809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 104976, while the sum is 44.

The square root of 90369809 is about 9506.3036454765. The cubic root of 90369809 is about 448.7534372789.

The spelling of 90369809 in words is "ninety million, three hundred sixty-nine thousand, eight hundred nine".