256316231 has 2 divisors, whose sum is σ = 256316232. Its totient is φ = 256316230.

The previous prime is 256316161. The next prime is 256316233. The reversal of 256316231 is 132613652.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-256316231 is a prime.

It is a super-2 number, since 2×256316231² = 131396020548090722, which contains 22 as substring.

Together with 256316233, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 256316194 and 256316203.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256316233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128158115 + 128158116.

It is an arithmetic number, because the mean of its divisors is an integer number (128158116).

Almost surely, 2^256316231 is an apocalyptic number.

256316231 is a deficient number, since it is larger than the sum of its proper divisors (1).

256316231 is an equidigital number, since it uses as much as digits as its factorization.

256316231 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6480, while the sum is 29.

The square root of 256316231 is about 16009.8791688132. The cubic root of 256316231 is about 635.2217639470.

Adding to 256316231 its reverse (132613652), we get a palindrome (388929883).

The spelling of 256316231 in words is "two hundred fifty-six million, three hundred sixteen thousand, two hundred thirty-one".