204612631 has 2 divisors, whose sum is σ = 204612632. Its totient is φ = 204612630.

The previous prime is 204612613. The next prime is 204612637. The reversal of 204612631 is 136216402.

Together with previous prime (204612613) 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 a de Polignac number, because none of the positive numbers 2^k-204612631 is a prime.

It is a super-2 number, since 2×204612631² = 83732657529484322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 204612596 and 204612605.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (204612637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102306315 + 102306316.

It is an arithmetic number, because the mean of its divisors is an integer number (102306316).

Almost surely, 2^204612631 is an apocalyptic number.

204612631 is a deficient number, since it is larger than the sum of its proper divisors (1).

204612631 is an equidigital number, since it uses as much as digits as its factorization.

204612631 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 204612631 is about 14304.2871545561. The cubic root of 204612631 is about 589.2652262636.

The spelling of 204612631 in words is "two hundred four million, six hundred twelve thousand, six hundred thirty-one".