231133657 has 2 divisors, whose sum is σ = 231133658. Its totient is φ = 231133656.

The previous prime is 231133607. The next prime is 231133699. The reversal of 231133657 is 756331132.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 229340736 + 1792921 = 15144^2 + 1339^2 .

It is a cyclic number.

It is not a de Polignac number, because 231133657 - 2²³ = 222745049 is a prime.

It is not a weakly prime, because it can be changed into another prime (231133607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115566828 + 115566829.

It is an arithmetic number, because the mean of its divisors is an integer number (115566829).

Almost surely, 2^231133657 is an apocalyptic number.

It is an amenable number.

231133657 is a deficient number, since it is larger than the sum of its proper divisors (1).

231133657 is an equidigital number, since it uses as much as digits as its factorization.

231133657 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11340, while the sum is 31.

The square root of 231133657 is about 15203.0805102124. The cubic root of 231133657 is about 613.6975604874.

Adding to 231133657 its reverse (756331132), we get a palindrome (987464789).

The spelling of 231133657 in words is "two hundred thirty-one million, one hundred thirty-three thousand, six hundred fifty-seven".