561923 has 2 divisors, whose sum is σ = 561924. Its totient is φ = 561922.

The previous prime is 561917. The next prime is 561931. The reversal of 561923 is 329165.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 561923 - 2⁴ = 561907 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 561892 and 561901.

It is not a weakly prime, because it can be changed into another prime (561943) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280961 + 280962.

It is an arithmetic number, because the mean of its divisors is an integer number (280962).

2⁵⁶¹⁹²³ is an apocalyptic number.

561923 is a deficient number, since it is larger than the sum of its proper divisors (1).

561923 is an equidigital number, since it uses as much as digits as its factorization.

561923 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1620, while the sum is 26.

The square root of 561923 is about 749.6152346371. The cubic root of 561923 is about 82.5199462026.

The spelling of 561923 in words is "five hundred sixty-one thousand, nine hundred twenty-three".