231144857 has 2 divisors, whose sum is σ = 231144858. Its totient is φ = 231144856.

The previous prime is 231144853. The next prime is 231144923. The reversal of 231144857 is 758441132.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 158281561 + 72863296 = 12581^2 + 8536^2 .

It is a cyclic number.

It is not a de Polignac number, because 231144857 - 2² = 231144853 is a prime.

It is not a weakly prime, because it can be changed into another prime (231144853) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115572428 + 115572429.

It is an arithmetic number, because the mean of its divisors is an integer number (115572429).

Almost surely, 2^231144857 is an apocalyptic number.

It is an amenable number.

231144857 is a deficient number, since it is larger than the sum of its proper divisors (1).

231144857 is an equidigital number, since it uses as much as digits as its factorization.

231144857 is an evil number, because the sum of its binary digits is even.

The product of its digits is 26880, while the sum is 35.

The square root of 231144857 is about 15203.4488521519. The cubic root of 231144857 is about 613.7074729363.

Adding to 231144857 its reverse (758441132), we get a palindrome (989585989).

The spelling of 231144857 in words is "two hundred thirty-one million, one hundred forty-four thousand, eight hundred fifty-seven".