231242431 has 4 divisors (see below), whose sum is σ = 264277072. Its totient is φ = 198207792.

The previous prime is 231242411. The next prime is 231242447. The reversal of 231242431 is 134242132.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 231242431 - 2⁹ = 231241919 is a prime.

It is a super-2 number, since 2×231242431² = 106946123789579522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231242411) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16517310 + ... + 16517323.

It is an arithmetic number, because the mean of its divisors is an integer number (66069268).

Almost surely, 2^231242431 is an apocalyptic number.

231242431 is a deficient number, since it is larger than the sum of its proper divisors (33034641).

231242431 is an equidigital number, since it uses as much as digits as its factorization.

231242431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33034640.

The product of its digits is 1152, while the sum is 22.

The square root of 231242431 is about 15206.6574565221. The cubic root of 231242431 is about 613.7938162935.

Adding to 231242431 its reverse (134242132), we get a palindrome (365484563).

The spelling of 231242431 in words is "two hundred thirty-one million, two hundred forty-two thousand, four hundred thirty-one".