204243413 has 4 divisors (see below), whose sum is σ = 222811008. Its totient is φ = 185675820.

The previous prime is 204243371. The next prime is 204243439. The reversal of 204243413 is 314342402.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 204243413 - 2⁸ = 204243157 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 11.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204243443) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9283781 + ... + 9283802.

It is an arithmetic number, because the mean of its divisors is an integer number (55702752).

Almost surely, 2^204243413 is an apocalyptic number.

It is an amenable number.

204243413 is a deficient number, since it is larger than the sum of its proper divisors (18567595).

204243413 is a wasteful number, since it uses less digits than its factorization.

204243413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18567594.

The product of its (nonzero) digits is 2304, while the sum is 23.

The square root of 204243413 is about 14291.3754761394. The cubic root of 204243413 is about 588.9105750976.

Adding to 204243413 its reverse (314342402), we get a palindrome (518585815).

The spelling of 204243413 in words is "two hundred four million, two hundred forty-three thousand, four hundred thirteen".