206206961 has 4 divisors (see below), whose sum is σ = 206726772. Its totient is φ = 205687152.

The previous prime is 206206951. The next prime is 206206967. The reversal of 206206961 is 169602602.

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

It can be written as a sum of positive squares in 2 ways, for example, as 133633600 + 72573361 = 11560^2 + 8519^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-206206961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (206206967) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 259310 + ... + 260103.

It is an arithmetic number, because the mean of its divisors is an integer number (51681693).

Almost surely, 2^206206961 is an apocalyptic number.

It is an amenable number.

206206961 is a deficient number, since it is larger than the sum of its proper divisors (519811).

206206961 is an equidigital number, since it uses as much as digits as its factorization.

206206961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 519810.

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 206206961 is about 14359.9081125194. The cubic root of 206206961 is about 590.7917752336.

The spelling of 206206961 in words is "two hundred six million, two hundred six thousand, nine hundred sixty-one".