902009 has 2 divisors, whose sum is σ = 902010. Its totient is φ = 902008.

The previous prime is 901997. The next prime is 902017. The reversal of 902009 is 900209.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 739600 + 162409 = 860^2 + 403^2 .

It is a cyclic number.

It is not a de Polignac number, because 902009 - 2⁴ = 901993 is a prime.

It is not a weakly prime, because it can be changed into another prime (902029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 451004 + 451005.

It is an arithmetic number, because the mean of its divisors is an integer number (451005).

2⁹⁰²⁰⁰⁹ is an apocalyptic number.

It is an amenable number.

902009 is a deficient number, since it is larger than the sum of its proper divisors (1).

902009 is an equidigital number, since it uses as much as digits as its factorization.

902009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 162, while the sum is 20.

The square root of 902009 is about 949.7415437897. The cubic root of 902009 is about 96.6207246348.

It can be divided in two parts, 90200 and 9, that added together give a palindrome (90209).

The spelling of 902009 in words is "nine hundred two thousand, nine".