204971131 has 4 divisors (see below), whose sum is σ = 205139952. Its totient is φ = 204802312.

The previous prime is 204971113. The next prime is 204971141. The reversal of 204971131 is 131179402.

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 204971131 - 2⁵ = 204971099 is a prime.

It is a super-2 number, since 2×204971131² = 84026329086838322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 204971131.

It is not an unprimeable number, because it can be changed into a prime (204971111) 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, 82576 + ... + 85021.

It is an arithmetic number, because the mean of its divisors is an integer number (51284988).

Almost surely, 2^204971131 is an apocalyptic number.

204971131 is a deficient number, since it is larger than the sum of its proper divisors (168821).

204971131 is a wasteful number, since it uses less digits than its factorization.

204971131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 168820.

The product of its (nonzero) digits is 1512, while the sum is 28.

The square root of 204971131 is about 14316.8128785704. The cubic root of 204971131 is about 589.6091742809.

The spelling of 204971131 in words is "two hundred four million, nine hundred seventy-one thousand, one hundred thirty-one".