561456208139 has 2 divisors, whose sum is σ = 561456208140. Its totient is φ = 561456208138.

The previous prime is 561456208099. The next prime is 561456208147. The reversal of 561456208139 is 931802654165.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-561456208139 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (561456207139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280728104069 + 280728104070.

It is an arithmetic number, because the mean of its divisors is an integer number (280728104070).

Almost surely, 2^561456208139 is an apocalyptic number.

561456208139 is a deficient number, since it is larger than the sum of its proper divisors (1).

561456208139 is an equidigital number, since it uses as much as digits as its factorization.

561456208139 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1555200, while the sum is 50.

The spelling of 561456208139 in words is "five hundred sixty-one billion, four hundred fifty-six million, two hundred eight thousand, one hundred thirty-nine".