212731166 has 12 divisors (see below), whose sum is σ = 338972208. Its totient is φ = 100108512.

The previous prime is 212731159. The next prime is 212731177. The reversal of 212731166 is 661137212.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 183446 + ... + 184601.

It is an arithmetic number, because the mean of its divisors is an integer number (28247684).

Almost surely, 2^212731166 is an apocalyptic number.

212731166 is a deficient number, since it is larger than the sum of its proper divisors (126241042).

212731166 is a wasteful number, since it uses less digits than its factorization.

212731166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 368083 (or 368066 counting only the distinct ones).

The product of its digits is 3024, while the sum is 29.

The square root of 212731166 is about 14585.3065103206. The cubic root of 212731166 is about 596.9579040057.

Adding to 212731166 its reverse (661137212), we get a palindrome (873868378).

The spelling of 212731166 in words is "two hundred twelve million, seven hundred thirty-one thousand, one hundred sixty-six".