211361161 has 4 divisors (see below), whose sum is σ = 230575824. Its totient is φ = 192146500.

The previous prime is 211361159. The next prime is 211361167. The reversal of 211361161 is 161163112.

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 211361161 - 2¹ = 211361159 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (211361167) 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, 9607315 + ... + 9607336.

It is an arithmetic number, because the mean of its divisors is an integer number (57643956).

Almost surely, 2^211361161 is an apocalyptic number.

It is an amenable number.

211361161 is a deficient number, since it is larger than the sum of its proper divisors (19214663).

211361161 is a wasteful number, since it uses less digits than its factorization.

211361161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19214662.

The product of its digits is 216, while the sum is 22.

The square root of 211361161 is about 14538.2654054739. The cubic root of 211361161 is about 595.6736582950.

The spelling of 211361161 in words is "two hundred eleven million, three hundred sixty-one thousand, one hundred sixty-one".