209961159 has 4 divisors (see below), whose sum is σ = 279948216. Its totient is φ = 139974104.

The previous prime is 209961149. The next prime is 209961161. The reversal of 209961159 is 951169902.

It is a happy number.

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 209961159 - 2¹⁵ = 209928391 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 209961159.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (209961139) 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, 34993524 + ... + 34993529.

It is an arithmetic number, because the mean of its divisors is an integer number (69987054).

Almost surely, 2^209961159 is an apocalyptic number.

209961159 is a deficient number, since it is larger than the sum of its proper divisors (69987057).

209961159 is an equidigital number, since it uses as much as digits as its factorization.

209961159 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69987056.

The product of its (nonzero) digits is 43740, while the sum is 42.

The square root of 209961159 is about 14490.0365423970. The cubic root of 209961159 is about 594.3555473227.

It can be divided in two parts, 20996 and 1159, that added together give a triangular number (22155 = T₂₁₀).

The spelling of 209961159 in words is "two hundred nine million, nine hundred sixty-one thousand, one hundred fifty-nine".