256255457 has 4 divisors (see below), whose sum is σ = 256621716. Its totient is φ = 255889200.

The previous prime is 256255429. The next prime is 256255463. The reversal of 256255457 is 754552652.

256255457 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 233967616 + 22287841 = 15296^2 + 4721^2 .

It is a cyclic number.

It is not a de Polignac number, because 256255457 - 2¹⁸ = 255993313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256255427) 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, 182078 + ... + 183479.

It is an arithmetic number, because the mean of its divisors is an integer number (64155429).

Almost surely, 2^256255457 is an apocalyptic number.

It is an amenable number.

256255457 is a deficient number, since it is larger than the sum of its proper divisors (366259).

256255457 is an equidigital number, since it uses as much as digits as its factorization.

256255457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 366258.

The product of its digits is 420000, while the sum is 41.

The square root of 256255457 is about 16007.9810407184. The cubic root of 256255457 is about 635.1715551108.

The spelling of 256255457 in words is "two hundred fifty-six million, two hundred fifty-five thousand, four hundred fifty-seven".