256351447 has 24 divisors (see below), whose sum is σ = 289697408. Its totient is φ = 226599120.

The previous prime is 256351441. The next prime is 256351451. The reversal of 256351447 is 744153652.

It is not a de Polignac number, because 256351447 - 2¹¹ = 256349399 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256351441) 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, 834868 + ... + 835174.

Almost surely, 2^256351447 is an apocalyptic number.

256351447 is a deficient number, since it is larger than the sum of its proper divisors (33345961).

256351447 is a wasteful number, since it uses less digits than its factorization.

256351447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 499 (or 488 counting only the distinct ones).

The product of its digits is 100800, while the sum is 37.

The square root of 256351447 is about 16010.9789519567. The cubic root of 256351447 is about 635.2508542432.

The spelling of 256351447 in words is "two hundred fifty-six million, three hundred fifty-one thousand, four hundred forty-seven".