561881841 has 16 divisors (see below), whose sum is σ = 793727424. Its totient is φ = 352338944.

The previous prime is 561881833. The next prime is 561881843. The reversal of 561881841 is 148188165.

It is a cyclic number.

It is not a de Polignac number, because 561881841 - 2³ = 561881833 is a prime.

It is a super-2 number, since 2×561881841² = 631422406491098562, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 561881793 and 561881802.

It is not an unprimeable number, because it can be changed into a prime (561881843) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 145846 + ... + 149648.

It is an arithmetic number, because the mean of its divisors is an integer number (49607964).

Almost surely, 2^561881841 is an apocalyptic number.

561881841 is a gapful number since it is divisible by the number (51) formed by its first and last digit.

It is an amenable number.

561881841 is a deficient number, since it is larger than the sum of its proper divisors (231845583).

561881841 is a wasteful number, since it uses less digits than its factorization.

561881841 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6720.

The product of its digits is 61440, while the sum is 42.

The square root of 561881841 is about 23704.0469329606. The cubic root of 561881841 is about 825.1793138240.

The spelling of 561881841 in words is "five hundred sixty-one million, eight hundred eighty-one thousand, eight hundred forty-one".