231342457 has 2 divisors, whose sum is σ = 231342458. Its totient is φ = 231342456.

The previous prime is 231342437. The next prime is 231342469. The reversal of 231342457 is 754243132.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 140635881 + 90706576 = 11859^2 + 9524^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-231342457 is a prime.

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

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115671228 + 115671229.

It is an arithmetic number, because the mean of its divisors is an integer number (115671229).

Almost surely, 2^231342457 is an apocalyptic number.

It is an amenable number.

231342457 is a deficient number, since it is larger than the sum of its proper divisors (1).

231342457 is an equidigital number, since it uses as much as digits as its factorization.

231342457 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20160, while the sum is 31.

The square root of 231342457 is about 15209.9459893847. The cubic root of 231342457 is about 613.8823042205.

Adding to 231342457 its reverse (754243132), we get a palindrome (985585589).

The spelling of 231342457 in words is "two hundred thirty-one million, three hundred forty-two thousand, four hundred fifty-seven".