231313031 has 2 divisors, whose sum is σ = 231313032. Its totient is φ = 231313030.

The previous prime is 231313013. The next prime is 231313057. The reversal of 231313031 is 130313132.

Together with previous prime (231313013) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 231313031 - 2¹⁴ = 231296647 is a prime.

It is a super-2 number, since 2×231313031² = 107011436620813922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231313091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115656515 + 115656516.

It is an arithmetic number, because the mean of its divisors is an integer number (115656516).

Almost surely, 2^231313031 is an apocalyptic number.

231313031 is a deficient number, since it is larger than the sum of its proper divisors (1).

231313031 is an equidigital number, since it uses as much as digits as its factorization.

231313031 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 162, while the sum is 17.

The square root of 231313031 is about 15208.9786310587. The cubic root of 231313031 is about 613.8562751798.

Adding to 231313031 its reverse (130313132), we get a palindrome (361626163).

It can be divided in two parts, 23131 and 3031, that added together give a palindrome (26162).

The spelling of 231313031 in words is "two hundred thirty-one million, three hundred thirteen thousand, thirty-one".