231342557 has 2 divisors, whose sum is σ = 231342558. Its totient is φ = 231342556.

The previous prime is 231342539. The next prime is 231342563. The reversal of 231342557 is 755243132.

231342557 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 can be written as a sum of positive squares in only one way, i.e., 199204996 + 32137561 = 14114^2 + 5669^2 .

It is a cyclic number.

It is not a de Polignac number, because 231342557 - 2⁶ = 231342493 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231342577) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115671278 + 115671279.

It is an arithmetic number, because the mean of its divisors is an integer number (115671279).

Almost surely, 2^231342557 is an apocalyptic number.

It is an amenable number.

231342557 is a deficient number, since it is larger than the sum of its proper divisors (1).

231342557 is an equidigital number, since it uses as much as digits as its factorization.

231342557 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25200, while the sum is 32.

The square root of 231342557 is about 15209.9492767070. The cubic root of 231342557 is about 613.8823926726.

Adding to 231342557 its reverse (755243132), we get a palindrome (986585689).

The spelling of 231342557 in words is "two hundred thirty-one million, three hundred forty-two thousand, five hundred fifty-seven".