256715233 has 2 divisors, whose sum is σ = 256715234. Its totient is φ = 256715232.

The previous prime is 256715209. The next prime is 256715293. The reversal of 256715233 is 332517652.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 247369984 + 9345249 = 15728^2 + 3057^2 .

It is a cyclic number.

It is not a de Polignac number, because 256715233 - 2¹³ = 256707041 is a prime.

It is not a weakly prime, because it can be changed into another prime (256715293) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128357616 + 128357617.

It is an arithmetic number, because the mean of its divisors is an integer number (128357617).

Almost surely, 2^256715233 is an apocalyptic number.

It is an amenable number.

256715233 is a deficient number, since it is larger than the sum of its proper divisors (1).

256715233 is an equidigital number, since it uses as much as digits as its factorization.

256715233 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 37800, while the sum is 34.

The square root of 256715233 is about 16022.3354415017. The cubic root of 256715233 is about 635.5512051104.

The spelling of 256715233 in words is "two hundred fifty-six million, seven hundred fifteen thousand, two hundred thirty-three".