309428017 has 2 divisors, whose sum is σ = 309428018. Its totient is φ = 309428016.

The previous prime is 309427967. The next prime is 309428027. The reversal of 309428017 is 710824903.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 178462881 + 130965136 = 13359^2 + 11444^2 .

It is a cyclic number.

It is not a de Polignac number, because 309428017 - 2⁷ = 309427889 is a prime.

It is not a weakly prime, because it can be changed into another prime (309428027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 154714008 + 154714009.

It is an arithmetic number, because the mean of its divisors is an integer number (154714009).

Almost surely, 2^309428017 is an apocalyptic number.

It is an amenable number.

309428017 is a deficient number, since it is larger than the sum of its proper divisors (1).

309428017 is an equidigital number, since it uses as much as digits as its factorization.

309428017 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 309428017 is about 17590.5661364266. The cubic root of 309428017 is about 676.3734391081.

The spelling of 309428017 in words is "three hundred nine million, four hundred twenty-eight thousand, seventeen".