561121156 has 24 divisors (see below), whose sum is σ = 1046465280. Its totient is φ = 262650432.

The previous prime is 561121151. The next prime is 561121163. The reversal of 561121156 is 651121165.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (561121151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 60561 + ... + 69208.

It is an arithmetic number, because the mean of its divisors is an integer number (43602720).

Almost surely, 2^561121156 is an apocalyptic number.

It is an amenable number.

561121156 is a deficient number, since it is larger than the sum of its proper divisors (485344124).

561121156 is a wasteful number, since it uses less digits than its factorization.

561121156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129843 (or 129841 counting only the distinct ones).

The product of its digits is 1800, while the sum is 28.

The square root of 561121156 is about 23687.9960317457. The cubic root of 561121156 is about 824.8067651504.

Subtracting 561121156 from its reverse (651121165), we obtain a palindrome (90000009).

The spelling of 561121156 in words is "five hundred sixty-one million, one hundred twenty-one thousand, one hundred fifty-six".