561864843 has 12 divisors (see below), whose sum is σ = 841641528. Its totient is φ = 374576400.

The previous prime is 561864833. The next prime is 561864851. The reversal of 561864843 is 348468165.

561864843 is a `hidden beast` number, since 561 + 8 + 6 + 4 + 84 + 3 = 666.

It is not a de Polignac number, because 561864843 - 2⁸ = 561864587 is a prime.

It is not an unprimeable number, because it can be changed into a prime (561864803) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1155858 + ... + 1156343.

It is an arithmetic number, because the mean of its divisors is an integer number (70136794).

Almost surely, 2^561864843 is an apocalyptic number.

561864843 is a deficient number, since it is larger than the sum of its proper divisors (279776685).

561864843 is an equidigital number, since it uses as much as digits as its factorization.

561864843 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2312216 (or 2312204 counting only the distinct ones).

The product of its digits is 552960, while the sum is 45.

The square root of 561864843 is about 23703.6883838782. The cubic root of 561864843 is about 825.1709926561.

The spelling of 561864843 in words is "five hundred sixty-one million, eight hundred sixty-four thousand, eight hundred forty-three".