204931 has 2 divisors, whose sum is σ = 204932. Its totient is φ = 204930.

The previous prime is 204923. The next prime is 204947. The reversal of 204931 is 139402.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 204931 - 2³ = 204923 is a prime.

It is a super-2 number, since 2×204931² = 83993429522, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 204899 and 204908.

It is not a weakly prime, because it can be changed into another prime (204331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102465 + 102466.

It is an arithmetic number, because the mean of its divisors is an integer number (102466).

2²⁰⁴⁹³¹ is an apocalyptic number.

204931 is a deficient number, since it is larger than the sum of its proper divisors (1).

204931 is an equidigital number, since it uses as much as digits as its factorization.

204931 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 204931 is about 452.6930527410. The cubic root of 204931 is about 58.9570692195.

It can be divided in two parts, 2049 and 31, that added together give a triangular number (2080 = T₆₄).

The spelling of 204931 in words is "two hundred four thousand, nine hundred thirty-one".