561983 has 2 divisors, whose sum is σ = 561984. Its totient is φ = 561982.

The previous prime is 561973. The next prime is 561997. The reversal of 561983 is 389165.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 561983 - 2¹⁴ = 545599 is a prime.

It is a Chen prime.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (561923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280991 + 280992.

It is an arithmetic number, because the mean of its divisors is an integer number (280992).

2⁵⁶¹⁹⁸³ is an apocalyptic number.

561983 is a deficient number, since it is larger than the sum of its proper divisors (1).

561983 is an equidigital number, since it uses as much as digits as its factorization.

561983 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6480, while the sum is 32.

The square root of 561983 is about 749.6552541002. The cubic root of 561983 is about 82.5228831533.

The spelling of 561983 in words is "five hundred sixty-one thousand, nine hundred eighty-three".