561111210 has 96 divisors (see below), whose sum is σ = 1606692672. Its totient is φ = 134730240.

The previous prime is 561111209. The next prime is 561111223. The reversal of 561111210 is 12111165.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18).

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 47 ways as a sum of consecutive naturals, for example, 103282 + ... + 108578.

It is an arithmetic number, because the mean of its divisors is an integer number (16736382).

Almost surely, 2^561111210 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 561111210, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (803346336).

561111210 is an abundant number, since it is smaller than the sum of its proper divisors (1045581462).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

561111210 is a wasteful number, since it uses less digits than its factorization.

561111210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5428 (or 5425 counting only the distinct ones).

The product of its (nonzero) digits is 60, while the sum is 18.

The square root of 561111210 is about 23687.7860932591. The cubic root of 561111210 is about 824.8018918258.

Adding to 561111210 its reverse (12111165), we get a palindrome (573222375).

The spelling of 561111210 in words is "five hundred sixty-one million, one hundred eleven thousand, two hundred ten".