256435877 has 2 divisors, whose sum is σ = 256435878. Its totient is φ = 256435876.

The previous prime is 256435859. The next prime is 256435903. The reversal of 256435877 is 778534652.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 136445761 + 119990116 = 11681^2 + 10954^2 .

It is a cyclic number.

It is not a de Polignac number, because 256435877 - 2¹² = 256431781 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256435847) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128217938 + 128217939.

It is an arithmetic number, because the mean of its divisors is an integer number (128217939).

Almost surely, 2^256435877 is an apocalyptic number.

It is an amenable number.

256435877 is a deficient number, since it is larger than the sum of its proper divisors (1).

256435877 is an equidigital number, since it uses as much as digits as its factorization.

256435877 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1411200, while the sum is 47.

The square root of 256435877 is about 16013.6153631839. The cubic root of 256435877 is about 635.3205870822.

The spelling of 256435877 in words is "two hundred fifty-six million, four hundred thirty-five thousand, eight hundred seventy-seven".