206874721 has 2 divisors, whose sum is σ = 206874722. Its totient is φ = 206874720.

The previous prime is 206874671. The next prime is 206874791. The reversal of 206874721 is 127478602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 119246400 + 87628321 = 10920^2 + 9361^2 .

It is a cyclic number.

It is not a de Polignac number, because 206874721 - 2⁹ = 206874209 is a prime.

It is not a weakly prime, because it can be changed into another prime (206874791) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103437360 + 103437361.

It is an arithmetic number, because the mean of its divisors is an integer number (103437361).

Almost surely, 2^206874721 is an apocalyptic number.

It is an amenable number.

206874721 is a deficient number, since it is larger than the sum of its proper divisors (1).

206874721 is an equidigital number, since it uses as much as digits as its factorization.

206874721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 37632, while the sum is 37.

The square root of 206874721 is about 14383.1401647902. The cubic root of 206874721 is about 591.4288084263.

The spelling of 206874721 in words is "two hundred six million, eight hundred seventy-four thousand, seven hundred twenty-one".