561004891 has 8 divisors (see below), whose sum is σ = 588026880. Its totient is φ = 534202152.

The previous prime is 561004889. The next prime is 561004931. The reversal of 561004891 is 198400165.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 561004891 - 2¹ = 561004889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (561007891) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49561 + ... + 59818.

It is an arithmetic number, because the mean of its divisors is an integer number (73503360).

Almost surely, 2^561004891 is an apocalyptic number.

561004891 is a deficient number, since it is larger than the sum of its proper divisors (27021989).

561004891 is a wasteful number, since it uses less digits than its factorization.

561004891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109625.

The product of its (nonzero) digits is 8640, while the sum is 34.

The square root of 561004891 is about 23685.5418135199. The cubic root of 561004891 is about 824.7497942202.

The spelling of 561004891 in words is "five hundred sixty-one million, four thousand, eight hundred ninety-one".