561551240 has 64 divisors (see below), whose sum is σ = 1282089600. Its totient is φ = 221340672.

The previous prime is 561551231. The next prime is 561551303. The reversal of 561551240 is 42155165.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1278941 + ... + 1279379.

It is an arithmetic number, because the mean of its divisors is an integer number (20032650).

Almost surely, 2^561551240 is an apocalyptic number.

It is an amenable number.

561551240 is an abundant number, since it is smaller than the sum of its proper divisors (720538360).

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

561551240 is a wasteful number, since it uses less digits than its factorization.

561551240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 846 (or 842 counting only the distinct ones).

The product of its (nonzero) digits is 6000, while the sum is 29.

The square root of 561551240 is about 23697.0723930194. The cubic root of 561551240 is about 825.0174419331.

The spelling of 561551240 in words is "five hundred sixty-one million, five hundred fifty-one thousand, two hundred forty".