309220469 has 2 divisors, whose sum is σ = 309220470. Its totient is φ = 309220468.

The previous prime is 309220453. The next prime is 309220501. The reversal of 309220469 is 964022903.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 300606244 + 8614225 = 17338^2 + 2935^2 .

It is a cyclic number.

It is not a de Polignac number, because 309220469 - 2⁴ = 309220453 is a prime.

It is a super-2 number, since 2×309220469² = 191234596897159922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (309220369) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 154610234 + 154610235.

It is an arithmetic number, because the mean of its divisors is an integer number (154610235).

Almost surely, 2^309220469 is an apocalyptic number.

It is an amenable number.

309220469 is a deficient number, since it is larger than the sum of its proper divisors (1).

309220469 is an equidigital number, since it uses as much as digits as its factorization.

309220469 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23328, while the sum is 35.

The square root of 309220469 is about 17584.6657346678. The cubic root of 309220469 is about 676.2221800699. Note that the first 3 decimals are identical.

The spelling of 309220469 in words is "three hundred nine million, two hundred twenty thousand, four hundred sixty-nine".