909490009 has 2 divisors, whose sum is σ = 909490010. Its totient is φ = 909490008.

The previous prime is 909489941. The next prime is 909490037. The reversal of 909490009 is 900094909.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 845937225 + 63552784 = 29085^2 + 7972^2 .

It is a cyclic number.

It is not a de Polignac number, because 909490009 - 2⁷ = 909489881 is a prime.

It is not a weakly prime, because it can be changed into another prime (909490039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 454745004 + 454745005.

It is an arithmetic number, because the mean of its divisors is an integer number (454745005).

Almost surely, 2^909490009 is an apocalyptic number.

It is an amenable number.

909490009 is a deficient number, since it is larger than the sum of its proper divisors (1).

909490009 is an equidigital number, since it uses as much as digits as its factorization.

909490009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 26244, while the sum is 40.

The square root of 909490009 is about 30157.7520548200. The cubic root of 909490009 is about 968.8710459970.

The spelling of 909490009 in words is "nine hundred nine million, four hundred ninety thousand, nine".