561215804 has 12 divisors (see below), whose sum is σ = 983271744. Its totient is φ = 280281024.

The previous prime is 561215789. The next prime is 561215807. The reversal of 561215804 is 408512165.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561215807) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 77837 + ... + 84740.

It is an arithmetic number, because the mean of its divisors is an integer number (81939312).

Almost surely, 2^561215804 is an apocalyptic number.

It is an amenable number.

561215804 is a deficient number, since it is larger than the sum of its proper divisors (422055940).

561215804 is a wasteful number, since it uses less digits than its factorization.

561215804 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163444 (or 163442 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 32.

The square root of 561215804 is about 23689.9937526374. The cubic root of 561215804 is about 824.8531377391.

Adding to 561215804 its reverse (408512165), we get a palindrome (969727969).

The spelling of 561215804 in words is "five hundred sixty-one million, two hundred fifteen thousand, eight hundred four".