561310863 has 64 divisors (see below), whose sum is σ = 855360000. Its totient is φ = 325817856.

The previous prime is 561310819. The next prime is 561310909. The reversal of 561310863 is 368013165.

It is a Cunningham number, because it is equal to 23692²-1.

It is not a de Polignac number, because 561310863 - 2¹³ = 561302671 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561330863) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3767113 + ... + 3767261.

It is an arithmetic number, because the mean of its divisors is an integer number (13365000).

Almost surely, 2^561310863 is an apocalyptic number.

561310863 is a gapful number since it is divisible by the number (53) formed by its first and last digit.

561310863 is a deficient number, since it is larger than the sum of its proper divisors (294049137).

561310863 is a wasteful number, since it uses less digits than its factorization.

561310863 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 296.

The product of its (nonzero) digits is 12960, while the sum is 33.

The square root of 561310863 is about 23691.9999788958. Note that the first 4 decimals coincide. The cubic root of 561310863 is about 824.8997064490.

The spelling of 561310863 in words is "five hundred sixty-one million, three hundred ten thousand, eight hundred sixty-three".