204315131 has 2 divisors, whose sum is σ = 204315132. Its totient is φ = 204315130.

The previous prime is 204315043. The next prime is 204315143. The reversal of 204315131 is 131513402.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-204315131 is a prime.

It is a super-2 number, since 2×204315131² = 83489345511094322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (204315191) 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 as a sum of consecutive naturals, namely, 102157565 + 102157566.

It is an arithmetic number, because the mean of its divisors is an integer number (102157566).

Almost surely, 2^204315131 is an apocalyptic number.

204315131 is a deficient number, since it is larger than the sum of its proper divisors (1).

204315131 is an equidigital number, since it uses as much as digits as its factorization.

204315131 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 204315131 is about 14293.8843915851. The cubic root of 204315131 is about 588.9794970202.

Adding to 204315131 its reverse (131513402), we get a palindrome (335828533).

The spelling of 204315131 in words is "two hundred four million, three hundred fifteen thousand, one hundred thirty-one".