561289621 has 8 divisors (see below), whose sum is σ = 604572320. Its totient is φ = 519381072.

The previous prime is 561289613. The next prime is 561289633. The reversal of 561289621 is 126982165.

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 561289621 - 2³ = 561289613 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561289661) 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, 342690 + ... + 344323.

It is an arithmetic number, because the mean of its divisors is an integer number (75571540).

Almost surely, 2^561289621 is an apocalyptic number.

It is an amenable number.

561289621 is a deficient number, since it is larger than the sum of its proper divisors (43282699).

561289621 is a wasteful number, since it uses less digits than its factorization.

561289621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 687075.

The product of its digits is 51840, while the sum is 40.

The square root of 561289621 is about 23691.5516798710. The cubic root of 561289621 is about 824.8893006045.

The spelling of 561289621 in words is "five hundred sixty-one million, two hundred eighty-nine thousand, six hundred twenty-one".