256301861 has 2 divisors, whose sum is σ = 256301862. Its totient is φ = 256301860.

The previous prime is 256301821. The next prime is 256301863. The reversal of 256301861 is 168103652.

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., 219928900 + 36372961 = 14830^2 + 6031^2 .

It is a cyclic number.

It is not a de Polignac number, because 256301861 - 2¹⁸ = 256039717 is a prime.

Together with 256301863, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256301863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128150930 + 128150931.

It is an arithmetic number, because the mean of its divisors is an integer number (128150931).

Almost surely, 2^256301861 is an apocalyptic number.

It is an amenable number.

256301861 is a deficient number, since it is larger than the sum of its proper divisors (1).

256301861 is an equidigital number, since it uses as much as digits as its factorization.

256301861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 256301861 is about 16009.4303771246. The cubic root of 256301861 is about 635.2098927944.

The spelling of 256301861 in words is "two hundred fifty-six million, three hundred one thousand, eight hundred sixty-one".