309669697 has 2 divisors, whose sum is σ = 309669698. Its totient is φ = 309669696.

The previous prime is 309669683. The next prime is 309669707. The reversal of 309669697 is 796966903.

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., 293916736 + 15752961 = 17144^2 + 3969^2 .

It is an emirp because it is prime and its reverse (796966903) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-309669697 is a prime.

It is not a weakly prime, because it can be changed into another prime (309669097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 154834848 + 154834849.

It is an arithmetic number, because the mean of its divisors is an integer number (154834849).

Almost surely, 2^309669697 is an apocalyptic number.

It is an amenable number.

309669697 is a deficient number, since it is larger than the sum of its proper divisors (1).

309669697 is an equidigital number, since it uses as much as digits as its factorization.

309669697 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3306744, while the sum is 55.

The square root of 309669697 is about 17597.4343868645. The cubic root of 309669697 is about 676.5494880152.

The spelling of 309669697 in words is "three hundred nine million, six hundred sixty-nine thousand, six hundred ninety-seven".