909490409 has 2 divisors, whose sum is σ = 909490410. Its totient is φ = 909490408.

The previous prime is 909490399. The next prime is 909490411. The reversal of 909490409 is 904094909.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 874503184 + 34987225 = 29572^2 + 5915^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-909490409 is a prime.

It is a Sophie Germain prime.

Together with 909490411, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 909490409.

It is not a weakly prime, because it can be changed into another prime (909490009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 454745204 + 454745205.

It is an arithmetic number, because the mean of its divisors is an integer number (454745205).

Almost surely, 2^909490409 is an apocalyptic number.

It is an amenable number.

909490409 is a deficient number, since it is larger than the sum of its proper divisors (1).

909490409 is an equidigital number, since it uses as much as digits as its factorization.

909490409 is an odious number, because the sum of its binary digits is odd.

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

The square root of 909490409 is about 30157.7586866133. The cubic root of 909490409 is about 968.8711880357.

The spelling of 909490409 in words is "nine hundred nine million, four hundred ninety thousand, four hundred nine".