231623857 has 2 divisors, whose sum is σ = 231623858. Its totient is φ = 231623856.

The previous prime is 231623831. The next prime is 231623881. The reversal of 231623857 is 758326132.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 229340736 + 2283121 = 15144^2 + 1511^2 .

It is a cyclic number.

It is not a de Polignac number, because 231623857 - 2²³ = 223235249 is a prime.

It is a super-2 number, since 2×231623857² = 107299222263112898, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (231623057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115811928 + 115811929.

It is an arithmetic number, because the mean of its divisors is an integer number (115811929).

Almost surely, 2^231623857 is an apocalyptic number.

It is an amenable number.

231623857 is a deficient number, since it is larger than the sum of its proper divisors (1).

231623857 is an equidigital number, since it uses as much as digits as its factorization.

231623857 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 60480, while the sum is 37.

The square root of 231623857 is about 15219.1937040042. The cubic root of 231623857 is about 614.1311077882.

Adding to 231623857 its reverse (758326132), we get a palindrome (989949989).

The spelling of 231623857 in words is "two hundred thirty-one million, six hundred twenty-three thousand, eight hundred fifty-seven".