561219820 has 24 divisors (see below), whose sum is σ = 1346927904. Its totient is φ = 192418176.

The previous prime is 561219817. The next prime is 561219823. The reversal of 561219820 is 28912165.

It is an interprime number because it is at equal distance from previous prime (561219817) and next prime (561219823).

It is not an unprimeable number, because it can be changed into a prime (561219823) 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, 2004217 + ... + 2004496.

It is an arithmetic number, because the mean of its divisors is an integer number (56121996).

Almost surely, 2^561219820 is an apocalyptic number.

It is an amenable number.

561219820 is an abundant number, since it is smaller than the sum of its proper divisors (785708084).

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

561219820 is a wasteful number, since it uses less digits than its factorization.

561219820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4008729 (or 4008727 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 34.

The square root of 561219820 is about 23690.0785140109. The cubic root of 561219820 is about 824.8551052546.

The spelling of 561219820 in words is "five hundred sixty-one million, two hundred nineteen thousand, eight hundred twenty".