231544031 has 2 divisors, whose sum is σ = 231544032. Its totient is φ = 231544030.

The previous prime is 231544003. The next prime is 231544037. The reversal of 231544031 is 130445132.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 231544031 - 2¹⁸ = 231281887 is a prime.

It is a super-2 number, since 2×231544031² = 107225276583457922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 231543988 and 231544006.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231544037) 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 as a sum of consecutive naturals, namely, 115772015 + 115772016.

It is an arithmetic number, because the mean of its divisors is an integer number (115772016).

Almost surely, 2^231544031 is an apocalyptic number.

231544031 is a deficient number, since it is larger than the sum of its proper divisors (1).

231544031 is an equidigital number, since it uses as much as digits as its factorization.

231544031 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 231544031 is about 15216.5709343465. The cubic root of 231544031 is about 614.0605490480.

Adding to 231544031 its reverse (130445132), we get a palindrome (361989163).

The spelling of 231544031 in words is "two hundred thirty-one million, five hundred forty-four thousand, thirty-one".