309434569 has 2 divisors, whose sum is σ = 309434570. Its totient is φ = 309434568.

The previous prime is 309434549. The next prime is 309434603. The reversal of 309434569 is 965434903.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 169911225 + 139523344 = 13035^2 + 11812^2 .

It is a cyclic number.

It is not a de Polignac number, because 309434569 - 2²³ = 301045961 is a prime.

It is a super-2 number, since 2×309434569² = 191499504984431522, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is not a weakly prime, because it can be changed into another prime (309434539) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 154717284 + 154717285.

It is an arithmetic number, because the mean of its divisors is an integer number (154717285).

Almost surely, 2^309434569 is an apocalyptic number.

It is an amenable number.

309434569 is a deficient number, since it is larger than the sum of its proper divisors (1).

309434569 is an equidigital number, since it uses as much as digits as its factorization.

309434569 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 349920, while the sum is 43.

The square root of 309434569 is about 17590.7523716298. The cubic root of 309434569 is about 676.3782130429.

The spelling of 309434569 in words is "three hundred nine million, four hundred thirty-four thousand, five hundred sixty-nine".