561111212 has 24 divisors (see below), whose sum is σ = 1001712096. Its totient is φ = 274921088.

The previous prime is 561111209. The next prime is 561111223. The reversal of 561111212 is 212111165.

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 7 ways as a sum of consecutive naturals, for example, 302873 + ... + 304719.

It is an arithmetic number, because the mean of its divisors is an integer number (41738004).

Almost surely, 2^561111212 is an apocalyptic number.

It is an amenable number.

561111212 is a deficient number, since it is larger than the sum of its proper divisors (440600884).

561111212 is a wasteful number, since it uses less digits than its factorization.

561111212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3337 (or 3335 counting only the distinct ones).

The product of its digits is 120, while the sum is 20.

The square root of 561111212 is about 23687.7861354750. The cubic root of 561111212 is about 824.8018928058.

Adding to 561111212 its reverse (212111165), we get a palindrome (773222377).

The spelling of 561111212 in words is "five hundred sixty-one million, one hundred eleven thousand, two hundred twelve".