206212631 has 4 divisors (see below), whose sum is σ = 208104600. Its totient is φ = 204320664.

The previous prime is 206212627. The next prime is 206212637. The reversal of 206212631 is 136212602.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 206212631 - 2² = 206212627 is a prime.

It is a super-2 number, since 2×206212631² = 85047298367884322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 206212597 and 206212606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206212637) 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 in 3 ways as a sum of consecutive naturals, for example, 945821 + ... + 946038.

It is an arithmetic number, because the mean of its divisors is an integer number (52026150).

Almost surely, 2^206212631 is an apocalyptic number.

206212631 is a deficient number, since it is larger than the sum of its proper divisors (1891969).

206212631 is a wasteful number, since it uses less digits than its factorization.

206212631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1891968.

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 206212631 is about 14360.1055358239. The cubic root of 206212631 is about 590.7971901149.

The spelling of 206212631 in words is "two hundred six million, two hundred twelve thousand, six hundred thirty-one".