256789147 has 2 divisors, whose sum is σ = 256789148. Its totient is φ = 256789146.

The previous prime is 256789129. The next prime is 256789177. The reversal of 256789147 is 741987652.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 256789147 - 2²³ = 248400539 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 256789147.

It is not a weakly prime, because it can be changed into another prime (256789177) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128394573 + 128394574.

It is an arithmetic number, because the mean of its divisors is an integer number (128394574).

Almost surely, 2^256789147 is an apocalyptic number.

256789147 is a deficient number, since it is larger than the sum of its proper divisors (1).

256789147 is an equidigital number, since it uses as much as digits as its factorization.

256789147 is an evil number, because the sum of its binary digits is even.

The product of its digits is 846720, while the sum is 49.

The square root of 256789147 is about 16024.6418680731. The cubic root of 256789147 is about 635.6121956789.

The spelling of 256789147 in words is "two hundred fifty-six million, seven hundred eighty-nine thousand, one hundred forty-seven".