231731339 has 6 divisors (see below), whose sum is σ = 269565084. Its totient is φ = 198626820.

The previous prime is 231731327. The next prime is 231731341. The reversal of 231731339 is 933137132.

It is a de Polignac number, because none of the positive numbers 2^k-231731339 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231731309) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2364557 + ... + 2364654.

It is an arithmetic number, because the mean of its divisors is an integer number (44927514).

Almost surely, 2^231731339 is an apocalyptic number.

231731339 is a deficient number, since it is larger than the sum of its proper divisors (37833745).

231731339 is an equidigital number, since it uses as much as digits as its factorization.

231731339 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4729225 (or 4729218 counting only the distinct ones).

The product of its digits is 10206, while the sum is 32.

The square root of 231731339 is about 15222.7244276443. The cubic root of 231731339 is about 614.2260862490.

The spelling of 231731339 in words is "two hundred thirty-one million, seven hundred thirty-one thousand, three hundred thirty-nine".