204672161 has 4 divisors (see below), whose sum is σ = 215444400. Its totient is φ = 193899924.

The previous prime is 204672151. The next prime is 204672179. The reversal of 204672161 is 161276402.

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 a cyclic number.

It is not a de Polignac number, because 204672161 - 2¹⁴ = 204655777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (204672151) 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 in 3 ways as a sum of consecutive naturals, for example, 5386091 + ... + 5386128.

It is an arithmetic number, because the mean of its divisors is an integer number (53861100).

Almost surely, 2^204672161 is an apocalyptic number.

It is an amenable number.

204672161 is a deficient number, since it is larger than the sum of its proper divisors (10772239).

204672161 is a wasteful number, since it uses less digits than its factorization.

204672161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10772238.

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 204672161 is about 14306.3678479200. The cubic root of 204672161 is about 589.3223676651.

The spelling of 204672161 in words is "two hundred four million, six hundred seventy-two thousand, one hundred sixty-one".