204640523 has 2 divisors, whose sum is σ = 204640524. Its totient is φ = 204640522.

The previous prime is 204640511. The next prime is 204640547. The reversal of 204640523 is 325046402.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 204640523 - 2¹⁰ = 204639499 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 204640492 and 204640501.

It is not a weakly prime, because it can be changed into another prime (204640823) 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, 102320261 + 102320262.

It is an arithmetic number, because the mean of its divisors is an integer number (102320262).

Almost surely, 2^204640523 is an apocalyptic number.

204640523 is a deficient number, since it is larger than the sum of its proper divisors (1).

204640523 is an equidigital number, since it uses as much as digits as its factorization.

204640523 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5760, while the sum is 26.

The square root of 204640523 is about 14305.2620737965. The cubic root of 204640523 is about 589.2920004968.

Adding to 204640523 its reverse (325046402), we get a palindrome (529686925).

The spelling of 204640523 in words is "two hundred four million, six hundred forty thousand, five hundred twenty-three".