204111613 has 4 divisors (see below), whose sum is σ = 204157660. Its totient is φ = 204065568.

The previous prime is 204111601. The next prime is 204111659. The reversal of 204111613 is 316111402.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 123165604 + 80946009 = 11098^2 + 8997^2 .

It is a cyclic number.

It is not a de Polignac number, because 204111613 - 2⁹ = 204111101 is a prime.

It is a super-2 number, since 2×204111613² = 83323101122923538, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204111113) 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, 15570 + ... + 25507.

It is an arithmetic number, because the mean of its divisors is an integer number (51039415).

Almost surely, 2^204111613 is an apocalyptic number.

It is an amenable number.

204111613 is a deficient number, since it is larger than the sum of its proper divisors (46047).

204111613 is an equidigital number, since it uses as much as digits as its factorization.

204111613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46046.

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 204111613 is about 14286.7635593230. The cubic root of 204111613 is about 588.7838715162.

The spelling of 204111613 in words is "two hundred four million, one hundred eleven thousand, six hundred thirteen".