206642437 has 2 divisors, whose sum is σ = 206642438. Its totient is φ = 206642436.

The previous prime is 206642399. The next prime is 206642453. The reversal of 206642437 is 734246602.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 116942596 + 89699841 = 10814^2 + 9471^2 .

It is a cyclic number.

It is not a de Polignac number, because 206642437 - 2²³ = 198253829 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (206642467) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103321218 + 103321219.

It is an arithmetic number, because the mean of its divisors is an integer number (103321219).

Almost surely, 2^206642437 is an apocalyptic number.

It is an amenable number.

206642437 is a deficient number, since it is larger than the sum of its proper divisors (1).

206642437 is an equidigital number, since it uses as much as digits as its factorization.

206642437 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48384, while the sum is 34.

The square root of 206642437 is about 14375.0630259488. The cubic root of 206642437 is about 591.2073686125.

The spelling of 206642437 in words is "two hundred six million, six hundred forty-two thousand, four hundred thirty-seven".