206990513 has 2 divisors, whose sum is σ = 206990514. Its totient is φ = 206990512.

The previous prime is 206990473. The next prime is 206990533. The reversal of 206990513 is 315099602.

206990513 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., 106028209 + 100962304 = 10297^2 + 10048^2 .

It is a cyclic number.

It is not a de Polignac number, because 206990513 - 2⁸ = 206990257 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (206990533) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103495256 + 103495257.

It is an arithmetic number, because the mean of its divisors is an integer number (103495257).

Almost surely, 2^206990513 is an apocalyptic number.

It is an amenable number.

206990513 is a deficient number, since it is larger than the sum of its proper divisors (1).

206990513 is an equidigital number, since it uses as much as digits as its factorization.

206990513 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14580, while the sum is 35.

The square root of 206990513 is about 14387.1648701195. The cubic root of 206990513 is about 591.5391327668.

The spelling of 206990513 in words is "two hundred six million, nine hundred ninety thousand, five hundred thirteen".