256903253 has 4 divisors (see below), whose sum is σ = 263169228. Its totient is φ = 250637280.

The previous prime is 256903249. The next prime is 256903271. The reversal of 256903253 is 352309652.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 148888804 + 108014449 = 12202^2 + 10393^2 .

It is a cyclic number.

It is not a de Polignac number, because 256903253 - 2² = 256903249 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256903453) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3132926 + ... + 3133007.

It is an arithmetic number, because the mean of its divisors is an integer number (65792307).

Almost surely, 2^256903253 is an apocalyptic number.

It is an amenable number.

256903253 is a deficient number, since it is larger than the sum of its proper divisors (6265975).

256903253 is an equidigital number, since it uses as much as digits as its factorization.

256903253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6265974.

The product of its (nonzero) digits is 48600, while the sum is 35.

The square root of 256903253 is about 16028.2018018242. The cubic root of 256903253 is about 635.7063279350.

The spelling of 256903253 in words is "two hundred fifty-six million, nine hundred three thousand, two hundred fifty-three".