206972687 has 2 divisors, whose sum is σ = 206972688. Its totient is φ = 206972686.

The previous prime is 206972669. The next prime is 206972693. The reversal of 206972687 is 786279602.

206972687 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-206972687 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (206972617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103486343 + 103486344.

It is an arithmetic number, because the mean of its divisors is an integer number (103486344).

Almost surely, 2^206972687 is an apocalyptic number.

206972687 is a deficient number, since it is larger than the sum of its proper divisors (1).

206972687 is an equidigital number, since it uses as much as digits as its factorization.

206972687 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 508032, while the sum is 47.

The square root of 206972687 is about 14386.5453462602. The cubic root of 206972687 is about 591.5221511845.

The spelling of 206972687 in words is "two hundred six million, nine hundred seventy-two thousand, six hundred eighty-seven".