206651281 has 4 divisors (see below), whose sum is σ = 209267200. Its totient is φ = 204035364.

The previous prime is 206651279. The next prime is 206651309. The reversal of 206651281 is 182156602.

206651281 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 206651281 - 2¹ = 206651279 is a prime.

It is a super-2 number, since 2×206651281² = 85409503877881922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (206651381) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1307841 + ... + 1307998.

It is an arithmetic number, because the mean of its divisors is an integer number (52316800).

Almost surely, 2^206651281 is an apocalyptic number.

It is an amenable number.

206651281 is a deficient number, since it is larger than the sum of its proper divisors (2615919).

206651281 is an equidigital number, since it uses as much as digits as its factorization.

206651281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2615918.

The product of its (nonzero) digits is 5760, while the sum is 31.

The square root of 206651281 is about 14375.3706387001. The cubic root of 206651281 is about 591.2158027680.

The spelling of 206651281 in words is "two hundred six million, six hundred fifty-one thousand, two hundred eighty-one".