561542019 has 4 divisors (see below), whose sum is σ = 748722696. Its totient is φ = 374361344.

The previous prime is 561541997. The next prime is 561542063. The reversal of 561542019 is 910245165.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 561542019 - 2⁷ = 561541891 is a prime.

It is a super-2 number, since 2×561542019² = 630658878205192722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (561642019) 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, 93590334 + ... + 93590339.

It is an arithmetic number, because the mean of its divisors is an integer number (187180674).

Almost surely, 2^561542019 is an apocalyptic number.

561542019 is a deficient number, since it is larger than the sum of its proper divisors (187180677).

561542019 is a wasteful number, since it uses less digits than its factorization.

561542019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187180676.

The product of its (nonzero) digits is 10800, while the sum is 33.

The square root of 561542019 is about 23696.8778323221. The cubic root of 561542019 is about 825.0129261519.

The spelling of 561542019 in words is "five hundred sixty-one million, five hundred forty-two thousand, nineteen".