256147222 has 4 divisors (see below), whose sum is σ = 384220836. Its totient is φ = 128073610.

The previous prime is 256147219. The next prime is 256147223. The reversal of 256147222 is 222741652.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×256147222² = 131222798676634568, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256147223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64036804 + ... + 64036807.

It is an arithmetic number, because the mean of its divisors is an integer number (96055209).

Almost surely, 2^256147222 is an apocalyptic number.

256147222 is a deficient number, since it is larger than the sum of its proper divisors (128073614).

256147222 is a wasteful number, since it uses less digits than its factorization.

256147222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128073613.

The product of its digits is 13440, while the sum is 31.

The square root of 256147222 is about 16004.6000262425. The cubic root of 256147222 is about 635.0821163981.

Adding to 256147222 its reverse (222741652), we get a palindrome (478888874).

The spelling of 256147222 in words is "two hundred fifty-six million, one hundred forty-seven thousand, two hundred twenty-two".