256814245 has 4 divisors (see below), whose sum is σ = 308177100. Its totient is φ = 205451392.

The previous prime is 256814191. The next prime is 256814249. The reversal of 256814245 is 542418652.

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 36796356 + 220017889 = 6066^2 + 14833^2 .

It is a cyclic number.

It is not a de Polignac number, because 256814245 - 2¹⁷ = 256683173 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256814249) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25681420 + ... + 25681429.

It is an arithmetic number, because the mean of its divisors is an integer number (77044275).

Almost surely, 2^256814245 is an apocalyptic number.

It is an amenable number.

256814245 is a deficient number, since it is larger than the sum of its proper divisors (51362855).

256814245 is an equidigital number, since it uses as much as digits as its factorization.

256814245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51362854.

The product of its digits is 76800, while the sum is 37.

The square root of 256814245 is about 16025.4249553639. The cubic root of 256814245 is about 635.6329027783.

The spelling of 256814245 in words is "two hundred fifty-six million, eight hundred fourteen thousand, two hundred forty-five".