309137009 has 2 divisors, whose sum is σ = 309137010. Its totient is φ = 309137008.

The previous prime is 309136981. The next prime is 309137021. The reversal of 309137009 is 900731903.

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., 285711409 + 23425600 = 16903^2 + 4840^2 .

It is an emirp because it is prime and its reverse (900731903) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-309137009 is a prime.

It is not a weakly prime, because it can be changed into another prime (309137029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 154568504 + 154568505.

It is an arithmetic number, because the mean of its divisors is an integer number (154568505).

Almost surely, 2^309137009 is an apocalyptic number.

It is an amenable number.

309137009 is a deficient number, since it is larger than the sum of its proper divisors (1).

309137009 is an equidigital number, since it uses as much as digits as its factorization.

309137009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5103, while the sum is 32.

The square root of 309137009 is about 17582.2924842013. The cubic root of 309137009 is about 676.1613361229.

The spelling of 309137009 in words is "three hundred nine million, one hundred thirty-seven thousand, nine".