231242309 has 2 divisors, whose sum is σ = 231242310. Its totient is φ = 231242308.

The previous prime is 231242287. The next prime is 231242357. The reversal of 231242309 is 903242132.

231242309 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 122102500 + 109139809 = 11050^2 + 10447^2 .

It is a cyclic number.

It is not a de Polignac number, because 231242309 - 2¹² = 231238213 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 (231242359) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115621154 + 115621155.

It is an arithmetic number, because the mean of its divisors is an integer number (115621155).

Almost surely, 2^231242309 is an apocalyptic number.

It is an amenable number.

231242309 is a deficient number, since it is larger than the sum of its proper divisors (1).

231242309 is an equidigital number, since it uses as much as digits as its factorization.

231242309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 26.

The square root of 231242309 is about 15206.6534451207. The cubic root of 231242309 is about 613.7937083507.

The spelling of 231242309 in words is "two hundred thirty-one million, two hundred forty-two thousand, three hundred nine".