206522531387 has 2 divisors, whose sum is σ = 206522531388. Its totient is φ = 206522531386.

The previous prime is 206522531377. The next prime is 206522531399. The reversal of 206522531387 is 783135225602.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 206522531387 - 2³⁶ = 137803054651 is a prime.

It is not a weakly prime, because it can be changed into another prime (206522531377) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103261265693 + 103261265694.

It is an arithmetic number, because the mean of its divisors is an integer number (103261265694).

Almost surely, 2^206522531387 is an apocalyptic number.

206522531387 is a deficient number, since it is larger than the sum of its proper divisors (1).

206522531387 is an equidigital number, since it uses as much as digits as its factorization.

206522531387 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 604800, while the sum is 44.

Adding to 206522531387 its reverse (783135225602), we get a palindrome (989657756989).

The spelling of 206522531387 in words is "two hundred six billion, five hundred twenty-two million, five hundred thirty-one thousand, three hundred eighty-seven".