231885257 has 2 divisors, whose sum is σ = 231885258. Its totient is φ = 231885256.

The previous prime is 231885223. The next prime is 231885271. The reversal of 231885257 is 752588132.

231885257 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., 123121216 + 108764041 = 11096^2 + 10429^2 .

It is a cyclic number.

It is not a de Polignac number, because 231885257 - 2¹⁴ = 231868873 is a prime.

It is not a weakly prime, because it can be changed into another prime (230885257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115942628 + 115942629.

It is an arithmetic number, because the mean of its divisors is an integer number (115942629).

Almost surely, 2^231885257 is an apocalyptic number.

It is an amenable number.

231885257 is a deficient number, since it is larger than the sum of its proper divisors (1).

231885257 is an equidigital number, since it uses as much as digits as its factorization.

231885257 is an evil number, because the sum of its binary digits is even.

The product of its digits is 134400, while the sum is 41.

The square root of 231885257 is about 15227.7791223803. The cubic root of 231885257 is about 614.3620476132.

The spelling of 231885257 in words is "two hundred thirty-one million, eight hundred eighty-five thousand, two hundred fifty-seven".