256187801 has 2 divisors, whose sum is σ = 256187802. Its totient is φ = 256187800.

The previous prime is 256187797. The next prime is 256187819. The reversal of 256187801 is 108781652.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 210975625 + 45212176 = 14525^2 + 6724^2 .

It is a cyclic number.

It is not a de Polignac number, because 256187801 - 2² = 256187797 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (256187821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128093900 + 128093901.

It is an arithmetic number, because the mean of its divisors is an integer number (128093901).

Almost surely, 2^256187801 is an apocalyptic number.

It is an amenable number.

256187801 is a deficient number, since it is larger than the sum of its proper divisors (1).

256187801 is an equidigital number, since it uses as much as digits as its factorization.

256187801 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 26880, while the sum is 38.

The square root of 256187801 is about 16005.8677053136. The cubic root of 256187801 is about 635.1156513267.

The spelling of 256187801 in words is "two hundred fifty-six million, one hundred eighty-seven thousand, eight hundred one".