256213453 has 2 divisors, whose sum is σ = 256213454. Its totient is φ = 256213452.

The previous prime is 256213417. The next prime is 256213471. The reversal of 256213453 is 354312652.

It is a happy number.

256213453 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 204976489 + 51236964 = 14317^2 + 7158^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-256213453 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256217453) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128106726 + 128106727.

It is an arithmetic number, because the mean of its divisors is an integer number (128106727).

Almost surely, 2^256213453 is an apocalyptic number.

It is an amenable number.

256213453 is a deficient number, since it is larger than the sum of its proper divisors (1).

256213453 is an equidigital number, since it uses as much as digits as its factorization.

256213453 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21600, while the sum is 31.

The square root of 256213453 is about 16006.6690163819. The cubic root of 256213453 is about 635.1368485928.

The spelling of 256213453 in words is "two hundred fifty-six million, two hundred thirteen thousand, four hundred fifty-three".