256219451 has 4 divisors (see below), whose sum is σ = 256598592. Its totient is φ = 255840312.

The previous prime is 256219441. The next prime is 256219463. The reversal of 256219451 is 154912652.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 256219451 - 2⁶ = 256219387 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256219441) 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, 188555 + ... + 189908.

It is an arithmetic number, because the mean of its divisors is an integer number (64149648).

Almost surely, 2^256219451 is an apocalyptic number.

256219451 is a deficient number, since it is larger than the sum of its proper divisors (379141).

256219451 is an equidigital number, since it uses as much as digits as its factorization.

256219451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 379140.

The product of its digits is 21600, while the sum is 35.

The square root of 256219451 is about 16006.8563746914. The cubic root of 256219451 is about 635.1418047742.

The spelling of 256219451 in words is "two hundred fifty-six million, two hundred nineteen thousand, four hundred fifty-one".