204402131 has 4 divisors (see below), whose sum is σ = 204912264. Its totient is φ = 203892000.

The previous prime is 204402119. The next prime is 204402139. The reversal of 204402131 is 131204402.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-204402131 is a prime.

It is a super-2 number, since 2×204402131² = 83560462314682322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (204402139) 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, 254465 + ... + 255266.

It is an arithmetic number, because the mean of its divisors is an integer number (51228066).

Almost surely, 2^204402131 is an apocalyptic number.

204402131 is a deficient number, since it is larger than the sum of its proper divisors (510133).

204402131 is an equidigital number, since it uses as much as digits as its factorization.

204402131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 510132.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 204402131 is about 14296.9273272266. The cubic root of 204402131 is about 589.0630834954.

Adding to 204402131 its reverse (131204402), we get a palindrome (335606533).

The spelling of 204402131 in words is "two hundred four million, four hundred two thousand, one hundred thirty-one".