561346621 has 32 divisors (see below), whose sum is σ = 667497600. Its totient is φ = 466560000.

The previous prime is 561346571. The next prime is 561346627. The reversal of 561346621 is 126643165.

It is a 6-Lehmer number, since φ(561346621) divides (561346621-1)⁶.

It is a cyclic number.

It is not a de Polignac number, because 561346621 - 2¹³ = 561338429 is a prime.

It is a super-2 number, since 2×561346621² = 630220057816235282, which contains 22 as substring.

It is a Smith number, since the sum of its digits (34) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561346627) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 933721 + ... + 934321.

It is an arithmetic number, because the mean of its divisors is an integer number (20859300).

Almost surely, 2^561346621 is an apocalyptic number.

It is an amenable number.

561346621 is a deficient number, since it is larger than the sum of its proper divisors (106150979).

561346621 is a wasteful number, since it uses less digits than its factorization.

561346621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 781.

The product of its digits is 25920, while the sum is 34.

The square root of 561346621 is about 23692.7546097958. The cubic root of 561346621 is about 824.9172226711.

Adding to 561346621 its reverse (126643165), we get a palindrome (687989786).

The spelling of 561346621 in words is "five hundred sixty-one million, three hundred forty-six thousand, six hundred twenty-one".