256173147 has 24 divisors (see below), whose sum is σ = 374922288. Its totient is φ = 168537600.

The previous prime is 256173139. The next prime is 256173193. The reversal of 256173147 is 741371652.

It is a happy number.

256173147 is a `hidden beast` number, since 2 + 5 + 617 + 31 + 4 + 7 = 666.

It is not a de Polignac number, because 256173147 - 2³ = 256173139 is a prime.

It is not an unprimeable number, because it can be changed into a prime (256173107) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 336247 + ... + 337007.

It is an arithmetic number, because the mean of its divisors is an integer number (15621762).

Almost surely, 2^256173147 is an apocalyptic number.

256173147 is a deficient number, since it is larger than the sum of its proper divisors (118749141).

256173147 is a wasteful number, since it uses less digits than its factorization.

256173147 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1211 (or 1208 counting only the distinct ones).

The product of its digits is 35280, while the sum is 36.

The square root of 256173147 is about 16005.4099291458. The cubic root of 256173147 is about 635.1035415096.

The spelling of 256173147 in words is "two hundred fifty-six million, one hundred seventy-three thousand, one hundred forty-seven".