309611969 has 2 divisors, whose sum is σ = 309611970. Its totient is φ = 309611968.

The previous prime is 309611957. The next prime is 309611989. The reversal of 309611969 is 969116903.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 296252944 + 13359025 = 17212^2 + 3655^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-309611969 is a prime.

It is a super-2 number, since 2×309611969² = 191719142696113922, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (309611989) 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, 154805984 + 154805985.

It is an arithmetic number, because the mean of its divisors is an integer number (154805985).

Almost surely, 2^309611969 is an apocalyptic number.

It is an amenable number.

309611969 is a deficient number, since it is larger than the sum of its proper divisors (1).

309611969 is an equidigital number, since it uses as much as digits as its factorization.

309611969 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 78732, while the sum is 44.

The square root of 309611969 is about 17595.7940713115. The cubic root of 309611969 is about 676.5074450725.

The spelling of 309611969 in words is "three hundred nine million, six hundred eleven thousand, nine hundred sixty-nine".