256226869 has 2 divisors, whose sum is σ = 256226870. Its totient is φ = 256226868.

The previous prime is 256226863. The next prime is 256226879. The reversal of 256226869 is 968622652.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 203490225 + 52736644 = 14265^2 + 7262^2 .

It is a cyclic number.

It is not a de Polignac number, because 256226869 - 2⁷ = 256226741 is a prime.

It is a super-2 number, since 2×256226869² = 131304416795086322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256226863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128113434 + 128113435.

It is an arithmetic number, because the mean of its divisors is an integer number (128113435).

Almost surely, 2^256226869 is an apocalyptic number.

It is an amenable number.

256226869 is a deficient number, since it is larger than the sum of its proper divisors (1).

256226869 is an equidigital number, since it uses as much as digits as its factorization.

256226869 is an evil number, because the sum of its binary digits is even.

The product of its digits is 622080, while the sum is 46.

The square root of 256226869 is about 16007.0880862198. The cubic root of 256226869 is about 635.1479342028.

The spelling of 256226869 in words is "two hundred fifty-six million, two hundred twenty-six thousand, eight hundred sixty-nine".