204161641 has 4 divisors (see below), whose sum is σ = 204516052. Its totient is φ = 203807232.

The previous prime is 204161611. The next prime is 204161651. The reversal of 204161641 is 146161402.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 146161402 = 2 ⋅73080701.

It can be written as a sum of positive squares in 2 ways, for example, as 177422400 + 26739241 = 13320^2 + 5171^2 .

It is a cyclic number.

It is not a de Polignac number, because 204161641 - 2⁵ = 204161609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (204161611) 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, 176340 + ... + 177493.

It is an arithmetic number, because the mean of its divisors is an integer number (51129013).

Almost surely, 2^204161641 is an apocalyptic number.

It is an amenable number.

204161641 is a deficient number, since it is larger than the sum of its proper divisors (354411).

204161641 is an equidigital number, since it uses as much as digits as its factorization.

204161641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 354410.

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 204161641 is about 14288.5143034537. The cubic root of 204161641 is about 588.8319714632.

The spelling of 204161641 in words is "two hundred four million, one hundred sixty-one thousand, six hundred forty-one".