206061521 has 2 divisors, whose sum is σ = 206061522. Its totient is φ = 206061520.

The previous prime is 206061497. The next prime is 206061529. The reversal of 206061521 is 125160602.

206061521 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., 202749121 + 3312400 = 14239^2 + 1820^2 .

It is a cyclic number.

It is not a de Polignac number, because 206061521 - 2¹⁰ = 206060497 is a prime.

It is a super-2 number, since 2×206061521² = 84922700873666882, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (206061529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103030760 + 103030761.

It is an arithmetic number, because the mean of its divisors is an integer number (103030761).

Almost surely, 2^206061521 is an apocalyptic number.

It is an amenable number.

206061521 is a deficient number, since it is larger than the sum of its proper divisors (1).

206061521 is an equidigital number, since it uses as much as digits as its factorization.

206061521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 206061521 is about 14354.8431200066. The cubic root of 206061521 is about 590.6528452891.

The spelling of 206061521 in words is "two hundred six million, sixty-one thousand, five hundred twenty-one".