206015261 has 2 divisors, whose sum is σ = 206015262. Its totient is φ = 206015260.

The previous prime is 206015221. The next prime is 206015263. The reversal of 206015261 is 162510602.

206015261 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., 151536100 + 54479161 = 12310^2 + 7381^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-206015261 is a prime.

Together with 206015263, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (206015263) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103007630 + 103007631.

It is an arithmetic number, because the mean of its divisors is an integer number (103007631).

Almost surely, 2^206015261 is an apocalyptic number.

It is an amenable number.

206015261 is a deficient number, since it is larger than the sum of its proper divisors (1).

206015261 is an equidigital number, since it uses as much as digits as its factorization.

206015261 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 206015261 is about 14353.2317266879. The cubic root of 206015261 is about 590.6086422352.

Adding to 206015261 its reverse (162510602), we get a palindrome (368525863).

The spelling of 206015261 in words is "two hundred six million, fifteen thousand, two hundred sixty-one".