206211631 has 2 divisors, whose sum is σ = 206211632. Its totient is φ = 206211630.

The previous prime is 206211613. The next prime is 206211637. The reversal of 206211631 is 136112602.

Together with previous prime (206211613) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 206211631 - 2⁹ = 206211119 is a prime.

It is a super-2 number, since 2×206211631² = 85046473519360322, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (206211637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103105815 + 103105816.

It is an arithmetic number, because the mean of its divisors is an integer number (103105816).

Almost surely, 2^206211631 is an apocalyptic number.

206211631 is a deficient number, since it is larger than the sum of its proper divisors (1).

206211631 is an equidigital number, since it uses as much as digits as its factorization.

206211631 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 206211631 is about 14360.0707170961. The cubic root of 206211631 is about 590.7962351166.

The spelling of 206211631 in words is "two hundred six million, two hundred eleven thousand, six hundred thirty-one".