256229609 has 4 divisors (see below), whose sum is σ = 256666704. Its totient is φ = 255792516.

The previous prime is 256229579. The next prime is 256229629. The reversal of 256229609 is 906922652.

256229609 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, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-256229609 is a prime.

It is a super-2 number, since 2×256229609² = 131307225056585762, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (256229629) 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, 217667 + ... + 218840.

It is an arithmetic number, because the mean of its divisors is an integer number (64166676).

Almost surely, 2^256229609 is an apocalyptic number.

It is an amenable number.

256229609 is a deficient number, since it is larger than the sum of its proper divisors (437095).

256229609 is an equidigital number, since it uses as much as digits as its factorization.

256229609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 437094.

The product of its (nonzero) digits is 116640, while the sum is 41.

The square root of 256229609 is about 16007.1736730755. The cubic root of 256229609 is about 635.1501982109.

The spelling of 256229609 in words is "two hundred fifty-six million, two hundred twenty-nine thousand, six hundred nine".