256515461 has 2 divisors, whose sum is σ = 256515462. Its totient is φ = 256515460.

The previous prime is 256515451. The next prime is 256515509. The reversal of 256515461 is 164515652.

256515461 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 148230625 + 108284836 = 12175^2 + 10406^2 .

It is a cyclic number.

It is not a de Polignac number, because 256515461 - 2¹⁰ = 256514437 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 (256515451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128257730 + 128257731.

It is an arithmetic number, because the mean of its divisors is an integer number (128257731).

Almost surely, 2^256515461 is an apocalyptic number.

It is an amenable number.

256515461 is a deficient number, since it is larger than the sum of its proper divisors (1).

256515461 is an equidigital number, since it uses as much as digits as its factorization.

256515461 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36000, while the sum is 35.

The square root of 256515461 is about 16016.1000558813. The cubic root of 256515461 is about 635.3863034770.

The spelling of 256515461 in words is "two hundred fifty-six million, five hundred fifteen thousand, four hundred sixty-one".