206891013 has 16 divisors (see below), whose sum is σ = 323784320. Its totient is φ = 115027776.

The previous prime is 206890997. The next prime is 206891021. The reversal of 206891013 is 310198602.

It is not a de Polignac number, because 206891013 - 2⁴ = 206890997 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206891033) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 132358 + ... + 133911.

It is an arithmetic number, because the mean of its divisors is an integer number (20236520).

Almost surely, 2^206891013 is an apocalyptic number.

It is an amenable number.

206891013 is a deficient number, since it is larger than the sum of its proper divisors (116893307).

206891013 is a wasteful number, since it uses less digits than its factorization.

206891013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 266316.

The product of its (nonzero) digits is 2592, while the sum is 30.

The square root of 206891013 is about 14383.7065111883. The cubic root of 206891013 is about 591.4443336117. Note that the first 3 decimals are identical.

The spelling of 206891013 in words is "two hundred six million, eight hundred ninety-one thousand, thirteen".