232505309 has 2 divisors, whose sum is σ = 232505310. Its totient is φ = 232505308.

The previous prime is 232505293. The next prime is 232505347. The reversal of 232505309 is 903505232.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 174821284 + 57684025 = 13222^2 + 7595^2 .

It is a cyclic number.

It is not a de Polignac number, because 232505309 - 2⁴ = 232505293 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (232505369) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 116252654 + 116252655.

It is an arithmetic number, because the mean of its divisors is an integer number (116252655).

Almost surely, 2^232505309 is an apocalyptic number.

It is an amenable number.

232505309 is a deficient number, since it is larger than the sum of its proper divisors (1).

232505309 is an equidigital number, since it uses as much as digits as its factorization.

232505309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8100, while the sum is 29.

The square root of 232505309 is about 15248.1247699512. The cubic root of 232505309 is about 614.9091535231.

The spelling of 232505309 in words is "two hundred thirty-two million, five hundred five thousand, three hundred nine".