206961109 has 4 divisors (see below), whose sum is σ = 207093760. Its totient is φ = 206828460.

The previous prime is 206961101. The next prime is 206961113. The reversal of 206961109 is 901169602.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 206961109 - 2³ = 206961101 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 (206961101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 63957 + ... + 67114.

It is an arithmetic number, because the mean of its divisors is an integer number (51773440).

Almost surely, 2^206961109 is an apocalyptic number.

It is an amenable number.

206961109 is a deficient number, since it is larger than the sum of its proper divisors (132651).

206961109 is a wasteful number, since it uses less digits than its factorization.

206961109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132650.

The product of its (nonzero) digits is 5832, while the sum is 34.

The square root of 206961109 is about 14386.1429507704. The cubic root of 206961109 is about 591.5111211121.

The spelling of 206961109 in words is "two hundred six million, nine hundred sixty-one thousand, one hundred nine".