206239613 has 2 divisors, whose sum is σ = 206239614. Its totient is φ = 206239612.

The previous prime is 206239609. The next prime is 206239637. The reversal of 206239613 is 316932602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 113252164 + 92987449 = 10642^2 + 9643^2 .

It is a cyclic number.

It is not a de Polignac number, because 206239613 - 2² = 206239609 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 206239613.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (206239013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103119806 + 103119807.

It is an arithmetic number, because the mean of its divisors is an integer number (103119807).

Almost surely, 2^206239613 is an apocalyptic number.

It is an amenable number.

206239613 is a deficient number, since it is larger than the sum of its proper divisors (1).

206239613 is an equidigital number, since it uses as much as digits as its factorization.

206239613 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11664, while the sum is 32.

The square root of 206239613 is about 14361.0449828695. The cubic root of 206239613 is about 590.8229567140.

The spelling of 206239613 in words is "two hundred six million, two hundred thirty-nine thousand, six hundred thirteen".