561287983 has 2 divisors, whose sum is σ = 561287984. Its totient is φ = 561287982.

The previous prime is 561287899. The next prime is 561288017. The reversal of 561287983 is 389782165.

561287983 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 561287983 - 2²¹ = 559190831 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (561287183) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280643991 + 280643992.

It is an arithmetic number, because the mean of its divisors is an integer number (280643992).

Almost surely, 2^561287983 is an apocalyptic number.

561287983 is a deficient number, since it is larger than the sum of its proper divisors (1).

561287983 is an equidigital number, since it uses as much as digits as its factorization.

561287983 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 725760, while the sum is 49.

The square root of 561287983 is about 23691.5171105609. The cubic root of 561287983 is about 824.8884981845. Note that the first 3 decimals are identical.

The spelling of 561287983 in words is "five hundred sixty-one million, two hundred eighty-seven thousand, nine hundred eighty-three".