204115231 has 2 divisors, whose sum is σ = 204115232. Its totient is φ = 204115230.

The previous prime is 204115213. The next prime is 204115237. The reversal of 204115231 is 132511402.

204115231 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

Together with previous prime (204115213) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 204115231 - 2⁷ = 204115103 is a prime.

It is a super-2 number, since 2×204115231² = 83326055052366722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 204115199 and 204115208.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (204115237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102057615 + 102057616.

It is an arithmetic number, because the mean of its divisors is an integer number (102057616).

Almost surely, 2^204115231 is an apocalyptic number.

204115231 is a deficient number, since it is larger than the sum of its proper divisors (1).

204115231 is an equidigital number, since it uses as much as digits as its factorization.

204115231 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 204115231 is about 14286.8901794617. The cubic root of 204115231 is about 588.7873503440.

Adding to 204115231 its reverse (132511402), we get a palindrome (336626633).

The spelling of 204115231 in words is "two hundred four million, one hundred fifteen thousand, two hundred thirty-one".