256037381 has 2 divisors, whose sum is σ = 256037382. Its totient is φ = 256037380.

The previous prime is 256037377. The next prime is 256037389. The reversal of 256037381 is 183730652.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 249324100 + 6713281 = 15790^2 + 2591^2 .

It is a cyclic number.

It is not a de Polignac number, because 256037381 - 2² = 256037377 is a prime.

It is a super-2 number, since 2×256037381² = 131110280938678322, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256037389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128018690 + 128018691.

It is an arithmetic number, because the mean of its divisors is an integer number (128018691).

Almost surely, 2^256037381 is an apocalyptic number.

It is an amenable number.

256037381 is a deficient number, since it is larger than the sum of its proper divisors (1).

256037381 is an equidigital number, since it uses as much as digits as its factorization.

256037381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 30240, while the sum is 35.

The square root of 256037381 is about 16001.1681136097. The cubic root of 256037381 is about 634.9913248241.

The spelling of 256037381 in words is "two hundred fifty-six million, thirty-seven thousand, three hundred eighty-one".