561337871 has 2 divisors, whose sum is σ = 561337872. Its totient is φ = 561337870.

The previous prime is 561337837. The next prime is 561337879. The reversal of 561337871 is 178733165.

561337871 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 a de Polignac number, because none of the positive numbers 2^k-561337871 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (561337879) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280668935 + 280668936.

It is an arithmetic number, because the mean of its divisors is an integer number (280668936).

Almost surely, 2^561337871 is an apocalyptic number.

561337871 is a deficient number, since it is larger than the sum of its proper divisors (1).

561337871 is an equidigital number, since it uses as much as digits as its factorization.

561337871 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 105840, while the sum is 41.

The square root of 561337871 is about 23692.5699534685. The cubic root of 561337871 is about 824.9129365118.

The spelling of 561337871 in words is "five hundred sixty-one million, three hundred thirty-seven thousand, eight hundred seventy-one".