231283309 has 2 divisors, whose sum is σ = 231283310. Its totient is φ = 231283308.

The previous prime is 231283303. The next prime is 231283357. The reversal of 231283309 is 903382132.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 231131209 + 152100 = 15203^2 + 390^2 .

It is a cyclic number.

It is not a de Polignac number, because 231283309 - 2³ = 231283301 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231283301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115641654 + 115641655.

It is an arithmetic number, because the mean of its divisors is an integer number (115641655).

Almost surely, 2^231283309 is an apocalyptic number.

It is an amenable number.

231283309 is a deficient number, since it is larger than the sum of its proper divisors (1).

231283309 is an equidigital number, since it uses as much as digits as its factorization.

231283309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7776, while the sum is 31.

The square root of 231283309 is about 15208.0014794844. The cubic root of 231283309 is about 613.8299820687.

The spelling of 231283309 in words is "two hundred thirty-one million, two hundred eighty-three thousand, three hundred nine".