206831693 has 2 divisors, whose sum is σ = 206831694. Its totient is φ = 206831692.

The previous prime is 206831623. The next prime is 206831759. The reversal of 206831693 is 396138602.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 142157929 + 64673764 = 11923^2 + 8042^2 .

It is a cyclic number.

It is not a de Polignac number, because 206831693 - 2⁸ = 206831437 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (206831623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103415846 + 103415847.

It is an arithmetic number, because the mean of its divisors is an integer number (103415847).

Almost surely, 2^206831693 is an apocalyptic number.

It is an amenable number.

206831693 is a deficient number, since it is larger than the sum of its proper divisors (1).

206831693 is an equidigital number, since it uses as much as digits as its factorization.

206831693 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 46656, while the sum is 38.

The square root of 206831693 is about 14381.6443079364. The cubic root of 206831693 is about 591.3878017030.

The spelling of 206831693 in words is "two hundred six million, eight hundred thirty-one thousand, six hundred ninety-three".