256451042 has 4 divisors (see below), whose sum is σ = 384676566. Its totient is φ = 128225520.

The previous prime is 256451021. The next prime is 256451053. The reversal of 256451042 is 240154652.

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

It can be written as a sum of positive squares in only one way, i.e., 248661361 + 7789681 = 15769^2 + 2791^2 .

It is a junction number, because it is equal to n+sod(n) for n = 256450996 and 256451014.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 64112759 + ... + 64112762.

Almost surely, 2^256451042 is an apocalyptic number.

256451042 is a deficient number, since it is larger than the sum of its proper divisors (128225524).

256451042 is a wasteful number, since it uses less digits than its factorization.

256451042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128225523.

The product of its (nonzero) digits is 9600, while the sum is 29.

The square root of 256451042 is about 16014.0888595012. The cubic root of 256451042 is about 635.3331106116. Note that the first 3 decimals are identical.

The spelling of 256451042 in words is "two hundred fifty-six million, four hundred fifty-one thousand, forty-two".