256574247 has 4 divisors (see below), whose sum is σ = 342099000. Its totient is φ = 171049496.

The previous prime is 256574221. The next prime is 256574257. The reversal of 256574247 is 742475652.

256574247 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 256574247 - 2¹² = 256570151 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 256574199 and 256574208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256574207) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42762372 + ... + 42762377.

It is an arithmetic number, because the mean of its divisors is an integer number (85524750).

Almost surely, 2^256574247 is an apocalyptic number.

256574247 is a deficient number, since it is larger than the sum of its proper divisors (85524753).

256574247 is an equidigital number, since it uses as much as digits as its factorization.

256574247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85524752.

The product of its digits is 470400, while the sum is 42.

The square root of 256574247 is about 16017.9351665563. The cubic root of 256574247 is about 635.4348372198.

The spelling of 256574247 in words is "two hundred fifty-six million, five hundred seventy-four thousand, two hundred forty-seven".