231731441 has 2 divisors, whose sum is σ = 231731442. Its totient is φ = 231731440.

The previous prime is 231731393. The next prime is 231731449. The reversal of 231731441 is 144137132.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 209641441 + 22090000 = 14479^2 + 4700^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-231731441 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 231731441.

It is not a weakly prime, because it can be changed into another prime (231731449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115865720 + 115865721.

It is an arithmetic number, because the mean of its divisors is an integer number (115865721).

Almost surely, 2^231731441 is an apocalyptic number.

It is an amenable number.

231731441 is a deficient number, since it is larger than the sum of its proper divisors (1).

231731441 is an equidigital number, since it uses as much as digits as its factorization.

231731441 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2016, while the sum is 26.

The square root of 231731441 is about 15222.7277778984. The cubic root of 231731441 is about 614.2261763693.

Adding to 231731441 its reverse (144137132), we get a palindrome (375868573).

The spelling of 231731441 in words is "two hundred thirty-one million, seven hundred thirty-one thousand, four hundred forty-one".