230431309 has 2 divisors, whose sum is σ = 230431310. Its totient is φ = 230431308.

The previous prime is 230431283. The next prime is 230431321. The reversal of 230431309 is 903134032.

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., 137405284 + 93026025 = 11722^2 + 9645^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-230431309 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (230431609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115215654 + 115215655.

It is an arithmetic number, because the mean of its divisors is an integer number (115215655).

Almost surely, 2^230431309 is an apocalyptic number.

It is an amenable number.

230431309 is a deficient number, since it is larger than the sum of its proper divisors (1).

230431309 is an equidigital number, since it uses as much as digits as its factorization.

230431309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1944, while the sum is 25.

The square root of 230431309 is about 15179.9640645161. The cubic root of 230431309 is about 613.0753136178.

The spelling of 230431309 in words is "two hundred thirty million, four hundred thirty-one thousand, three hundred nine".