561987043 has 4 divisors (see below), whose sum is σ = 577175920. Its totient is φ = 546798168.

The previous prime is 561987031. The next prime is 561987047. The reversal of 561987043 is 340789165.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 340789165 = 5 ⋅68157833.

It is a cyclic number.

It is not a de Polignac number, because 561987043 - 2²⁹ = 25116131 is a prime.

It is a super-3 number, since 3×561987043³ (a number of 27 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (561987047) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7594383 + ... + 7594456.

It is an arithmetic number, because the mean of its divisors is an integer number (144293980).

Almost surely, 2^561987043 is an apocalyptic number.

561987043 is a deficient number, since it is larger than the sum of its proper divisors (15188877).

561987043 is a wasteful number, since it uses less digits than its factorization.

561987043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15188876.

The product of its (nonzero) digits is 181440, while the sum is 43.

The square root of 561987043 is about 23706.2659016556. The cubic root of 561987043 is about 825.2308104736.

The spelling of 561987043 in words is "five hundred sixty-one million, nine hundred eighty-seven thousand, forty-three".