231116257 has 2 divisors, whose sum is σ = 231116258. Its totient is φ = 231116256.

The previous prime is 231116231. The next prime is 231116261. The reversal of 231116257 is 752611132.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 192626641 + 38489616 = 13879^2 + 6204^2 .

It is a cyclic number.

It is not a de Polignac number, because 231116257 - 2¹¹ = 231114209 is a prime.

It is not a weakly prime, because it can be changed into another prime (231116267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115558128 + 115558129.

It is an arithmetic number, because the mean of its divisors is an integer number (115558129).

Almost surely, 2^231116257 is an apocalyptic number.

It is an amenable number.

231116257 is a deficient number, since it is larger than the sum of its proper divisors (1).

231116257 is an equidigital number, since it uses as much as digits as its factorization.

231116257 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2520, while the sum is 28.

The square root of 231116257 is about 15202.5082469966. The cubic root of 231116257 is about 613.6821601549.

Adding to 231116257 its reverse (752611132), we get a palindrome (983727389).

The spelling of 231116257 in words is "two hundred thirty-one million, one hundred sixteen thousand, two hundred fifty-seven".