231716657 has 2 divisors, whose sum is σ = 231716658. Its totient is φ = 231716656.

The previous prime is 231716633. The next prime is 231716677. The reversal of 231716657 is 756617132.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 211295296 + 20421361 = 14536^2 + 4519^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-231716657 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 231716657.

It is not a weakly prime, because it can be changed into another prime (231716677) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115858328 + 115858329.

It is an arithmetic number, because the mean of its divisors is an integer number (115858329).

Almost surely, 2^231716657 is an apocalyptic number.

It is an amenable number.

231716657 is a deficient number, since it is larger than the sum of its proper divisors (1).

231716657 is an equidigital number, since it uses as much as digits as its factorization.

231716657 is an evil number, because the sum of its binary digits is even.

The product of its digits is 52920, while the sum is 38.

The square root of 231716657 is about 15222.2421804411. The cubic root of 231716657 is about 614.2131139598.

The spelling of 231716657 in words is "two hundred thirty-one million, seven hundred sixteen thousand, six hundred fifty-seven".