211080861 has 12 divisors (see below), whose sum is σ = 320941920. Its totient is φ = 133314120.

The previous prime is 211080847. The next prime is 211080911. The reversal of 211080861 is 168080112.

It is not a de Polignac number, because 211080861 - 2⁶ = 211080797 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211080841) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 617025 + ... + 617366.

It is an arithmetic number, because the mean of its divisors is an integer number (26745160).

Almost surely, 2^211080861 is an apocalyptic number.

It is an amenable number.

211080861 is a deficient number, since it is larger than the sum of its proper divisors (109861059).

211080861 is a wasteful number, since it uses less digits than its factorization.

211080861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1234416 (or 1234413 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 27.

The square root of 211080861 is about 14528.6221301264. The cubic root of 211080861 is about 595.4102210755.

The spelling of 211080861 in words is "two hundred eleven million, eighty thousand, eight hundred sixty-one".