561219818 has 16 divisors (see below), whose sum is σ = 848625120. Its totient is φ = 278354256.

The previous prime is 561219817. The next prime is 561219823. The reversal of 561219818 is 818912165.

It is not an unprimeable number, because it can be changed into a prime (561219817) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 130913 + ... + 135131.

It is an arithmetic number, because the mean of its divisors is an integer number (53039070).

Almost surely, 2^561219818 is an apocalyptic number.

561219818 is a deficient number, since it is larger than the sum of its proper divisors (287405302).

561219818 is a wasteful number, since it uses less digits than its factorization.

561219818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4741.

The product of its digits is 34560, while the sum is 41.

The square root of 561219818 is about 23690.0784717991. The cubic root of 561219818 is about 824.8551042747.

The spelling of 561219818 in words is "five hundred sixty-one million, two hundred nineteen thousand, eight hundred eighteen".