561111516 has 48 divisors (see below), whose sum is σ = 1662554880. Its totient is φ = 160317360.

The previous prime is 561111511. The next prime is 561111541. The reversal of 561111516 is 615111165.

561111516 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×561111516² = 629692266775636512, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 561111516.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561111511) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 370350 + ... + 371861.

It is an arithmetic number, because the mean of its divisors is an integer number (34636560).

Almost surely, 2^561111516 is an apocalyptic number.

It is an amenable number.

561111516 is an abundant number, since it is smaller than the sum of its proper divisors (1101443364).

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

561111516 is a wasteful number, since it uses less digits than its factorization.

561111516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 742231 (or 742223 counting only the distinct ones).

The product of its digits is 900, while the sum is 27.

The square root of 561111516 is about 23687.7925522831. The cubic root of 561111516 is about 824.8020417600.

The spelling of 561111516 in words is "five hundred sixty-one million, one hundred eleven thousand, five hundred sixteen".