231344431 has 2 divisors, whose sum is σ = 231344432. Its totient is φ = 231344430.

The previous prime is 231344401. The next prime is 231344447. The reversal of 231344431 is 134443132.

231344431 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 231344431 - 2⁹ = 231343919 is a prime.

It is a super-2 number, since 2×231344431² = 107040491509427522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 231344396 and 231344405.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231344401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115672215 + 115672216.

It is an arithmetic number, because the mean of its divisors is an integer number (115672216).

Almost surely, 2^231344431 is an apocalyptic number.

231344431 is a deficient number, since it is larger than the sum of its proper divisors (1).

231344431 is an equidigital number, since it uses as much as digits as its factorization.

231344431 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3456, while the sum is 25.

The square root of 231344431 is about 15210.0108809955. The cubic root of 231344431 is about 613.8840502614.

Adding to 231344431 its reverse (134443132), we get a palindrome (365787563).

The spelling of 231344431 in words is "two hundred thirty-one million, three hundred forty-four thousand, four hundred thirty-one".