256339173 has 4 divisors (see below), whose sum is σ = 341785568. Its totient is φ = 170892780.

The previous prime is 256339157. The next prime is 256339177. The reversal of 256339173 is 371933652.

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 256339173 - 2⁴ = 256339157 is a prime.

It is a super-2 number, since 2×256339173² = 131419543228647858, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256339177) 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, 42723193 + ... + 42723198.

It is an arithmetic number, because the mean of its divisors is an integer number (85446392).

Almost surely, 2^256339173 is an apocalyptic number.

It is an amenable number.

256339173 is a deficient number, since it is larger than the sum of its proper divisors (85446395).

256339173 is an equidigital number, since it uses as much as digits as its factorization.

256339173 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85446394.

The product of its digits is 102060, while the sum is 39.

The square root of 256339173 is about 16010.5956478827. The cubic root of 256339173 is about 635.2407155664.

The spelling of 256339173 in words is "two hundred fifty-six million, three hundred thirty-nine thousand, one hundred seventy-three".