211604161 has 4 divisors (see below), whose sum is σ = 216525232. Its totient is φ = 206683092.

The previous prime is 211604137. The next prime is 211604167. The reversal of 211604161 is 161406112.

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 211604161 - 2¹⁷ = 211473089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (211604167) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2460471 + ... + 2460556.

It is an arithmetic number, because the mean of its divisors is an integer number (54131308).

Almost surely, 2^211604161 is an apocalyptic number.

It is an amenable number.

211604161 is a deficient number, since it is larger than the sum of its proper divisors (4921071).

211604161 is an equidigital number, since it uses as much as digits as its factorization.

211604161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4921070.

The product of its (nonzero) digits is 288, while the sum is 22.

The square root of 211604161 is about 14546.6202603904. The cubic root of 211604161 is about 595.9018510585.

The spelling of 211604161 in words is "two hundred eleven million, six hundred four thousand, one hundred sixty-one".