204131131 has 4 divisors (see below), whose sum is σ = 204160264. Its totient is φ = 204102000.

The previous prime is 204131129. The next prime is 204131149. The reversal of 204131131 is 131131402.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 204131131 - 2¹ = 204131129 is a prime.

It is a super-2 number, since 2×204131131² = 83339037286678322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (204131171) 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, 3031 + ... + 20431.

It is an arithmetic number, because the mean of its divisors is an integer number (51040066).

Almost surely, 2^204131131 is an apocalyptic number.

204131131 is a deficient number, since it is larger than the sum of its proper divisors (29133).

204131131 is a wasteful number, since it uses less digits than its factorization.

204131131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29132.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 204131131 is about 14287.4466228224. The cubic root of 204131131 is about 588.8026382376.

Subtracting from 204131131 its sum of digits (16), we obtain a triangular number (204131115 = T₂₀₂₀₅).

Adding to 204131131 its reverse (131131402), we get a palindrome (335262533).

The spelling of 204131131 in words is "two hundred four million, one hundred thirty-one thousand, one hundred thirty-one".