206256881 has 2 divisors, whose sum is σ = 206256882. Its totient is φ = 206256880.

The previous prime is 206256859. The next prime is 206256943. The reversal of 206256881 is 188652602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 109411600 + 96845281 = 10460^2 + 9841^2 .

It is a cyclic number.

It is not a de Polignac number, because 206256881 - 2¹⁰ = 206255857 is a prime.

It is a super-2 number, since 2×206256881² = 85083801919696322, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (206256181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103128440 + 103128441.

It is an arithmetic number, because the mean of its divisors is an integer number (103128441).

Almost surely, 2^206256881 is an apocalyptic number.

It is an amenable number.

206256881 is a deficient number, since it is larger than the sum of its proper divisors (1).

206256881 is an equidigital number, since it uses as much as digits as its factorization.

206256881 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 46080, while the sum is 38.

The square root of 206256881 is about 14361.6461800171. The cubic root of 206256881 is about 590.8394456997.

The spelling of 206256881 in words is "two hundred six million, two hundred fifty-six thousand, eight hundred eighty-one".