256216229 has 2 divisors, whose sum is σ = 256216230. Its totient is φ = 256216228.

The previous prime is 256216211. The next prime is 256216237. The reversal of 256216229 is 922612652.

256216229 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 252969025 + 3247204 = 15905^2 + 1802^2 .

It is a cyclic number.

It is not a de Polignac number, because 256216229 - 2¹⁶ = 256150693 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256216249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128108114 + 128108115.

It is an arithmetic number, because the mean of its divisors is an integer number (128108115).

Almost surely, 2^256216229 is an apocalyptic number.

It is an amenable number.

256216229 is a deficient number, since it is larger than the sum of its proper divisors (1).

256216229 is an equidigital number, since it uses as much as digits as its factorization.

256216229 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25920, while the sum is 35.

The square root of 256216229 is about 16006.7557300035. The cubic root of 256216229 is about 635.1391424270.

The spelling of 256216229 in words is "two hundred fifty-six million, two hundred sixteen thousand, two hundred twenty-nine".