256173331 has 2 divisors, whose sum is σ = 256173332. Its totient is φ = 256173330.

The previous prime is 256173299. The next prime is 256173341. The reversal of 256173331 is 133371652.

256173331 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 256173331 - 2⁵ = 256173299 is a prime.

It is a super-2 number, since 2×256173331² = 131249551031271122, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 256173293 and 256173302.

It is not a weakly prime, because it can be changed into another prime (256173341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128086665 + 128086666.

It is an arithmetic number, because the mean of its divisors is an integer number (128086666).

Almost surely, 2^256173331 is an apocalyptic number.

256173331 is a deficient number, since it is larger than the sum of its proper divisors (1).

256173331 is an equidigital number, since it uses as much as digits as its factorization.

256173331 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11340, while the sum is 31.

The square root of 256173331 is about 16005.4156772013. The cubic root of 256173331 is about 635.1036935670.

The spelling of 256173331 in words is "two hundred fifty-six million, one hundred seventy-three thousand, three hundred thirty-one".