204243131 has 2 divisors, whose sum is σ = 204243132. Its totient is φ = 204243130.

The previous prime is 204243121. The next prime is 204243139. The reversal of 204243131 is 131342402.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-204243131 is a prime.

It is a super-2 number, since 2×204243131² = 83430513121366322, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (204243139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102121565 + 102121566.

It is an arithmetic number, because the mean of its divisors is an integer number (102121566).

Almost surely, 2^204243131 is an apocalyptic number.

204243131 is a deficient number, since it is larger than the sum of its proper divisors (1).

204243131 is an equidigital number, since it uses as much as digits as its factorization.

204243131 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 204243131 is about 14291.3656100458. The cubic root of 204243131 is about 588.9103040602.

Adding to 204243131 its reverse (131342402), we get a palindrome (335585533).

The spelling of 204243131 in words is "two hundred four million, two hundred forty-three thousand, one hundred thirty-one".