206507998531 has 2 divisors, whose sum is σ = 206507998532. Its totient is φ = 206507998530.

The previous prime is 206507998469. The next prime is 206507998547. The reversal of 206507998531 is 135899705602.

206507998531 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 not a de Polignac number, because 206507998531 - 2¹¹ = 206507996483 is a prime.

It is a super-2 number, since 2×206507998531² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (206507990531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103253999265 + 103253999266.

It is an arithmetic number, because the mean of its divisors is an integer number (103253999266).

Almost surely, 2^206507998531 is an apocalyptic number.

206507998531 is a deficient number, since it is larger than the sum of its proper divisors (1).

206507998531 is an equidigital number, since it uses as much as digits as its factorization.

206507998531 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4082400, while the sum is 55.

The spelling of 206507998531 in words is "two hundred six billion, five hundred seven million, nine hundred ninety-eight thousand, five hundred thirty-one".