206112989 has 2 divisors, whose sum is σ = 206112990. Its totient is φ = 206112988.

The previous prime is 206112937. The next prime is 206112997. The reversal of 206112989 is 989211602.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 196140025 + 9972964 = 14005^2 + 3158^2 .

It is a cyclic number.

It is not a de Polignac number, because 206112989 - 2⁸ = 206112733 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (206111989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103056494 + 103056495.

It is an arithmetic number, because the mean of its divisors is an integer number (103056495).

Almost surely, 2^206112989 is an apocalyptic number.

It is an amenable number.

206112989 is a deficient number, since it is larger than the sum of its proper divisors (1).

206112989 is an equidigital number, since it uses as much as digits as its factorization.

206112989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15552, while the sum is 38.

The square root of 206112989 is about 14356.6357131467. The cubic root of 206112989 is about 590.7020169958.

The spelling of 206112989 in words is "two hundred six million, one hundred twelve thousand, nine hundred eighty-nine".