231256261 has 2 divisors, whose sum is σ = 231256262. Its totient is φ = 231256260.

The previous prime is 231256247. The next prime is 231256297. The reversal of 231256261 is 162652132.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 225180036 + 6076225 = 15006^2 + 2465^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-231256261 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231256231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115628130 + 115628131.

It is an arithmetic number, because the mean of its divisors is an integer number (115628131).

Almost surely, 2^231256261 is an apocalyptic number.

It is an amenable number.

231256261 is a deficient number, since it is larger than the sum of its proper divisors (1).

231256261 is an equidigital number, since it uses as much as digits as its factorization.

231256261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4320, while the sum is 28.

The square root of 231256261 is about 15207.1121847641. The cubic root of 231256261 is about 613.8060525128.

The spelling of 231256261 in words is "two hundred thirty-one million, two hundred fifty-six thousand, two hundred sixty-one".