211681163 has 4 divisors (see below), whose sum is σ = 215151408. Its totient is φ = 208210920.

The previous prime is 211681139. The next prime is 211681177. The reversal of 211681163 is 361186112.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-211681163 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (211681103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1735031 + ... + 1735152.

It is an arithmetic number, because the mean of its divisors is an integer number (53787852).

Almost surely, 2^211681163 is an apocalyptic number.

211681163 is a deficient number, since it is larger than the sum of its proper divisors (3470245).

211681163 is an equidigital number, since it uses as much as digits as its factorization.

211681163 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3470244.

The product of its digits is 1728, while the sum is 29.

The square root of 211681163 is about 14549.2667512834. The cubic root of 211681163 is about 595.9741244791.

The spelling of 211681163 in words is "two hundred eleven million, six hundred eighty-one thousand, one hundred sixty-three".