206791969 has 2 divisors, whose sum is σ = 206791970. Its totient is φ = 206791968.

The previous prime is 206791913. The next prime is 206791993. The reversal of 206791969 is 969197602.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 206784400 + 7569 = 14380^2 + 87^2 .

It is a cyclic number.

It is not a de Polignac number, because 206791969 - 2⁷ = 206791841 is a prime.

It is a super-2 number, since 2×206791969² = 85525836885793922, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (206791909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103395984 + 103395985.

It is an arithmetic number, because the mean of its divisors is an integer number (103395985).

Almost surely, 2^206791969 is an apocalyptic number.

It is an amenable number.

206791969 is a deficient number, since it is larger than the sum of its proper divisors (1).

206791969 is an equidigital number, since it uses as much as digits as its factorization.

206791969 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 367416, while the sum is 49.

The square root of 206791969 is about 14380.2631756168. The cubic root of 206791969 is about 591.3499387224.

The spelling of 206791969 in words is "two hundred six million, seven hundred ninety-one thousand, nine hundred sixty-nine".