256581142 has 8 divisors (see below), whose sum is σ = 384959736. Its totient is φ = 128261232.

The previous prime is 256581139. The next prime is 256581151. The reversal of 256581142 is 241185652.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 256581098 and 256581107.

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, 1303 + ... + 22690.

It is an arithmetic number, because the mean of its divisors is an integer number (48119967).

Almost surely, 2^256581142 is an apocalyptic number.

256581142 is a deficient number, since it is larger than the sum of its proper divisors (128378594).

256581142 is a wasteful number, since it uses less digits than its factorization.

256581142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29342.

The product of its digits is 19200, while the sum is 34.

The square root of 256581142 is about 16018.1503926015. The cubic root of 256581142 is about 635.4405292486.

The spelling of 256581142 in words is "two hundred fifty-six million, five hundred eighty-one thousand, one hundred forty-two".