256463261 has 2 divisors, whose sum is σ = 256463262. Its totient is φ = 256463260.

The previous prime is 256463239. The next prime is 256463293. The reversal of 256463261 is 162364652.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 196168036 + 60295225 = 14006^2 + 7765^2 .

It is a cyclic number.

It is not a de Polignac number, because 256463261 - 2²⁶ = 189354397 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256463231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128231630 + 128231631.

It is an arithmetic number, because the mean of its divisors is an integer number (128231631).

Almost surely, 2^256463261 is an apocalyptic number.

It is an amenable number.

256463261 is a deficient number, since it is larger than the sum of its proper divisors (1).

256463261 is an equidigital number, since it uses as much as digits as its factorization.

256463261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 51840, while the sum is 35.

The square root of 256463261 is about 16014.4703627688. The cubic root of 256463261 is about 635.3432009222.

The spelling of 256463261 in words is "two hundred fifty-six million, four hundred sixty-three thousand, two hundred sixty-one".