256151047 has 4 divisors (see below), whose sum is σ = 264414016. Its totient is φ = 247888080.

The previous prime is 256151033. The next prime is 256151083. The reversal of 256151047 is 740151652.

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 256151047 - 2¹⁵ = 256118279 is a prime.

It is a super-2 number, since 2×256151047² = 131226717758392418, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (31), and also a Moran number because the ratio is a prime number: 8262937 = 256151047 / (2 + 5 + 6 + 1 + 5 + 1 + 0 + 4 + 7).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256151747) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4131438 + ... + 4131499.

It is an arithmetic number, because the mean of its divisors is an integer number (66103504).

Almost surely, 2^256151047 is an apocalyptic number.

256151047 is a deficient number, since it is larger than the sum of its proper divisors (8262969).

256151047 is an equidigital number, since it uses as much as digits as its factorization.

256151047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8262968.

The product of its (nonzero) digits is 8400, while the sum is 31.

The square root of 256151047 is about 16004.7195226908. The cubic root of 256151047 is about 635.0852775710.

It can be divided in two parts, 25615 and 1047, that added together give a palindrome (26662).

The spelling of 256151047 in words is "two hundred fifty-six million, one hundred fifty-one thousand, forty-seven".