231123257 has 2 divisors, whose sum is σ = 231123258. Its totient is φ = 231123256.

The previous prime is 231123229. The next prime is 231123271. The reversal of 231123257 is 752321132.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 133726096 + 97397161 = 11564^2 + 9869^2 .

It is a cyclic number.

It is not a de Polignac number, because 231123257 - 2²⁶ = 164014393 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (231123227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115561628 + 115561629.

It is an arithmetic number, because the mean of its divisors is an integer number (115561629).

Almost surely, 2^231123257 is an apocalyptic number.

It is an amenable number.

231123257 is a deficient number, since it is larger than the sum of its proper divisors (1).

231123257 is an equidigital number, since it uses as much as digits as its factorization.

231123257 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2520, while the sum is 26.

The square root of 231123257 is about 15202.7384704204. The cubic root of 231123257 is about 613.6883557839.

Adding to 231123257 its reverse (752321132), we get a palindrome (983444389).

The spelling of 231123257 in words is "two hundred thirty-one million, one hundred twenty-three thousand, two hundred fifty-seven".