256789453 has 4 divisors (see below), whose sum is σ = 256847580. Its totient is φ = 256731328.

The previous prime is 256789451. The next prime is 256789459. The reversal of 256789453 is 354987652.

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 47032164 + 209757289 = 6858^2 + 14483^2 .

It is a cyclic number.

It is not a de Polignac number, because 256789453 - 2¹ = 256789451 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 256789397 and 256789406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256789451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21838 + ... + 31471.

It is an arithmetic number, because the mean of its divisors is an integer number (64211895).

Almost surely, 2^256789453 is an apocalyptic number.

It is an amenable number.

256789453 is a deficient number, since it is larger than the sum of its proper divisors (58127).

256789453 is an equidigital number, since it uses as much as digits as its factorization.

256789453 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58126.

The product of its digits is 1814400, while the sum is 49.

The square root of 256789453 is about 16024.6514158655. The cubic root of 256789453 is about 635.6124481523.

The spelling of 256789453 in words is "two hundred fifty-six million, seven hundred eighty-nine thousand, four hundred fifty-three".