231431 has 2 divisors, whose sum is σ = 231432. Its totient is φ = 231430.

The previous prime is 231419. The next prime is 231433. The reversal of 231431 is 134132.

231431 is nontrivially palindromic in base 12.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 231431 - 2⁶ = 231367 is a prime.

It is a super-2 number, since 2×231431² = 107120615522, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 231433, it forms a pair of twin primes.

It is a Chen prime.

231431 is an undulating number in base 12.

It is a plaindrome in base 15.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 231431.

It is not a weakly prime, because it can be changed into another prime (231433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115715 + 115716.

It is an arithmetic number, because the mean of its divisors is an integer number (115716).

2²³¹⁴³¹ is an apocalyptic number.

231431 is a deficient number, since it is larger than the sum of its proper divisors (1).

231431 is an equidigital number, since it uses as much as digits as its factorization.

231431 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 72, while the sum is 14.

The square root of 231431 is about 481.0727595697. The cubic root of 231431 is about 61.3960612440.

Adding to 231431 its reverse (134132), we get a palindrome (365563).

The spelling of 231431 in words is "two hundred thirty-one thousand, four hundred thirty-one".