231342431 has 2 divisors, whose sum is σ = 231342432. Its totient is φ = 231342430.

The previous prime is 231342383. The next prime is 231342437. The reversal of 231342431 is 134243132.

231342431 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 231342431 - 2¹⁴ = 231326047 is a prime.

It is a super-2 number, since 2×231342431² = 107038640761979522, 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 = 231342397 and 231342406.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231342437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115671215 + 115671216.

It is an arithmetic number, because the mean of its divisors is an integer number (115671216).

Almost surely, 2^231342431 is an apocalyptic number.

231342431 is a deficient number, since it is larger than the sum of its proper divisors (1).

231342431 is an equidigital number, since it uses as much as digits as its factorization.

231342431 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1728, while the sum is 23.

The square root of 231342431 is about 15209.9451346808. The cubic root of 231342431 is about 613.8822812229.

Adding to 231342431 its reverse (134243132), we get a palindrome (365585563).

It can be divided in two parts, 2313 and 42431, that added together give a palindrome (44744).

The spelling of 231342431 in words is "two hundred thirty-one million, three hundred forty-two thousand, four hundred thirty-one".