256322143 has 32 divisors (see below), whose sum is σ = 337001472. Its totient is φ = 189024000.

The previous prime is 256322117. The next prime is 256322153. The reversal of 256322143 is 341223652.

It is not a de Polignac number, because 256322143 - 2¹³ = 256313951 is a prime.

It is a super-2 number, since 2×256322143² = 131402081984224898, 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 (256322113) 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 31 ways as a sum of consecutive naturals, for example, 178155 + ... + 179587.

It is an arithmetic number, because the mean of its divisors is an integer number (10531296).

Almost surely, 2^256322143 is an apocalyptic number.

256322143 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

256322143 is a deficient number, since it is larger than the sum of its proper divisors (80679329).

256322143 is a wasteful number, since it uses less digits than its factorization.

256322143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1575.

The product of its digits is 8640, while the sum is 28.

The square root of 256322143 is about 16010.0638037454. The cubic root of 256322143 is about 635.2266477608.

Adding to 256322143 its reverse (341223652), we get a palindrome (597545795).

The spelling of 256322143 in words is "two hundred fifty-six million, three hundred twenty-two thousand, one hundred forty-three".