256222749 has 4 divisors (see below), whose sum is σ = 341630336. Its totient is φ = 170815164.

The previous prime is 256222727. The next prime is 256222873. The reversal of 256222749 is 947222652.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 256222749 - 2⁵ = 256222717 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256922749) 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, 42703789 + ... + 42703794.

It is an arithmetic number, because the mean of its divisors is an integer number (85407584).

Almost surely, 2^256222749 is an apocalyptic number.

It is an amenable number.

256222749 is a deficient number, since it is larger than the sum of its proper divisors (85407587).

256222749 is an equidigital number, since it uses as much as digits as its factorization.

256222749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85407586.

The product of its digits is 120960, while the sum is 39.

The square root of 256222749 is about 16006.9593927142. The cubic root of 256222749 is about 635.1445298974.

The spelling of 256222749 in words is "two hundred fifty-six million, two hundred twenty-two thousand, seven hundred forty-nine".