256042753 has 4 divisors (see below), whose sum is σ = 257329600. Its totient is φ = 254755908.

The previous prime is 256042751. The next prime is 256042757. The reversal of 256042753 is 357240652.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 256042753 - 2¹ = 256042751 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256042751) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 643125 + ... + 643522.

It is an arithmetic number, because the mean of its divisors is an integer number (64332400).

Almost surely, 2^256042753 is an apocalyptic number.

It is an amenable number.

256042753 is a deficient number, since it is larger than the sum of its proper divisors (1286847).

256042753 is a wasteful number, since it uses less digits than its factorization.

256042753 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1286846.

The product of its (nonzero) digits is 50400, while the sum is 34.

The square root of 256042753 is about 16001.3359754740. The cubic root of 256042753 is about 634.9957657766.

The spelling of 256042753 in words is "two hundred fifty-six million, forty-two thousand, seven hundred fifty-three".