256445437 has 2 divisors, whose sum is σ = 256445438. Its totient is φ = 256445436.

The previous prime is 256445419. The next prime is 256445443. The reversal of 256445437 is 734544652.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 226622916 + 29822521 = 15054^2 + 5461^2 .

It is a cyclic number.

It is not a de Polignac number, because 256445437 - 2¹⁵ = 256412669 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 256445437.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256445407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128222718 + 128222719.

It is an arithmetic number, because the mean of its divisors is an integer number (128222719).

Almost surely, 2^256445437 is an apocalyptic number.

It is an amenable number.

256445437 is a deficient number, since it is larger than the sum of its proper divisors (1).

256445437 is an equidigital number, since it uses as much as digits as its factorization.

256445437 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 403200, while the sum is 40.

The square root of 256445437 is about 16013.9138563938. The cubic root of 256445437 is about 635.3284819595.

The spelling of 256445437 in words is "two hundred fifty-six million, four hundred forty-five thousand, four hundred thirty-seven".