206511113 has 2 divisors, whose sum is σ = 206511114. Its totient is φ = 206511112.

The previous prime is 206511101. The next prime is 206511127. The reversal of 206511113 is 311115602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 197908624 + 8602489 = 14068^2 + 2933^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-206511113 is a prime.

It is not a weakly prime, because it can be changed into another prime (206511313) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103255556 + 103255557.

It is an arithmetic number, because the mean of its divisors is an integer number (103255557).

Almost surely, 2^206511113 is an apocalyptic number.

It is an amenable number.

206511113 is a deficient number, since it is larger than the sum of its proper divisors (1).

206511113 is an equidigital number, since it uses as much as digits as its factorization.

206511113 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 180, while the sum is 20.

The square root of 206511113 is about 14370.4945287210. The cubic root of 206511113 is about 591.0821020402.

Adding to 206511113 its reverse (311115602), we get a palindrome (517626715).

The spelling of 206511113 in words is "two hundred six million, five hundred eleven thousand, one hundred thirteen".