561512540 has 24 divisors (see below), whose sum is σ = 1181658240. Its totient is φ = 224132288.

The previous prime is 561512527. The next prime is 561512551. The reversal of 561512540 is 45215165.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19727 + ... + 38886.

It is an arithmetic number, because the mean of its divisors is an integer number (49235760).

Almost surely, 2^561512540 is an apocalyptic number.

It is an amenable number.

561512540 is an abundant number, since it is smaller than the sum of its proper divisors (620145700).

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

561512540 is a wasteful number, since it uses less digits than its factorization.

561512540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59101 (or 59099 counting only the distinct ones).

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

The square root of 561512540 is about 23696.2558223868. The cubic root of 561512540 is about 824.9984891310.

It can be divided in two parts, 5615125 and 40, that added together give a palindrome (5615165).

The spelling of 561512540 in words is "five hundred sixty-one million, five hundred twelve thousand, five hundred forty".