256422251 has 8 divisors (see below), whose sum is σ = 260877024. Its totient is φ = 251991040.

The previous prime is 256422217. The next prime is 256422253. The reversal of 256422251 is 152224652.

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

It is a cyclic number.

It is not a de Polignac number, because 256422251 - 2²² = 252227947 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256422253) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16811 + ... + 28203.

It is an arithmetic number, because the mean of its divisors is an integer number (32609628).

Almost surely, 2^256422251 is an apocalyptic number.

256422251 is a deficient number, since it is larger than the sum of its proper divisors (4454773).

256422251 is a wasteful number, since it uses less digits than its factorization.

256422251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11781.

The product of its digits is 9600, while the sum is 29.

The square root of 256422251 is about 16013.1899070735. The cubic root of 256422251 is about 635.3093340654.

The spelling of 256422251 in words is "two hundred fifty-six million, four hundred twenty-two thousand, two hundred fifty-one".