256214605 has 4 divisors (see below), whose sum is σ = 307457532. Its totient is φ = 204971680.

The previous prime is 256214593. The next prime is 256214611. The reversal of 256214605 is 506412652.

256214605 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.

It can be written as a sum of positive squares in 2 ways, for example, as 80227849 + 175986756 = 8957^2 + 13266^2 .

It is not a de Polignac number, because 256214605 - 2¹⁵ = 256181837 is a prime.

It is a super-3 number, since 3×256214605³ (a number of 26 digits) contains 333 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25621456 + ... + 25621465.

It is an arithmetic number, because the mean of its divisors is an integer number (76864383).

Almost surely, 2^256214605 is an apocalyptic number.

It is an amenable number.

256214605 is a deficient number, since it is larger than the sum of its proper divisors (51242927).

256214605 is an equidigital number, since it uses as much as digits as its factorization.

256214605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51242926.

The product of its (nonzero) digits is 14400, while the sum is 31.

The square root of 256214605 is about 16006.7050013424. The cubic root of 256214605 is about 635.1378005029.

The spelling of 256214605 in words is "two hundred fifty-six million, two hundred fourteen thousand, six hundred five".