211686713 has 18 divisors (see below), whose sum is σ = 250056378. Its totient is φ = 178681440.

The previous prime is 211686707. The next prime is 211686719. The reversal of 211686713 is 317686112.

211686713 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (211686707) and next prime (211686719).

It can be written as a sum of positive squares in only one way, i.e., 207734569 + 3952144 = 14413^2 + 1988^2 .

It is not a de Polignac number, because 211686713 - 2²⁰ = 210638137 is a prime.

It is a super-2 number, since 2×211686713² = 89622528921488738, which contains 22 as substring.

It is a hoax number, since the sum of its digits (35) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (211686719) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 246581 + ... + 247437.

It is an arithmetic number, because the mean of its divisors is an integer number (13892021).

Almost surely, 2^211686713 is an apocalyptic number.

It is an amenable number.

211686713 is a deficient number, since it is larger than the sum of its proper divisors (38369665).

211686713 is an frugal number, since it uses more digits than its factorization.

211686713 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1013 (or 935 counting only the distinct ones).

The product of its digits is 12096, while the sum is 35.

The square root of 211686713 is about 14549.4574812946. The cubic root of 211686713 is about 595.9793329845.

The spelling of 211686713 in words is "two hundred eleven million, six hundred eighty-six thousand, seven hundred thirteen".