256442653 has 2 divisors, whose sum is σ = 256442654. Its totient is φ = 256442652.

The previous prime is 256442623. The next prime is 256442657. The reversal of 256442653 is 356244652.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 216031204 + 40411449 = 14698^2 + 6357^2 .

It is a cyclic number.

It is not a de Polignac number, because 256442653 - 2⁹ = 256442141 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256442657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128221326 + 128221327.

It is an arithmetic number, because the mean of its divisors is an integer number (128221327).

Almost surely, 2^256442653 is an apocalyptic number.

It is an amenable number.

256442653 is a deficient number, since it is larger than the sum of its proper divisors (1).

256442653 is an equidigital number, since it uses as much as digits as its factorization.

256442653 is an evil number, because the sum of its binary digits is even.

The product of its digits is 172800, while the sum is 37.

The square root of 256442653 is about 16013.8269317487. The cubic root of 256442653 is about 635.3261828857.

The spelling of 256442653 in words is "two hundred fifty-six million, four hundred forty-two thousand, six hundred fifty-three".