561662143 has 4 divisors (see below), whose sum is σ = 641899600. Its totient is φ = 481424688.

The previous prime is 561662141. The next prime is 561662149. The reversal of 561662143 is 341266165.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 561662143 - 2¹ = 561662141 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 561662099 and 561662108.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561662141) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40118718 + ... + 40118731.

It is an arithmetic number, because the mean of its divisors is an integer number (160474900).

Almost surely, 2^561662143 is an apocalyptic number.

561662143 is a deficient number, since it is larger than the sum of its proper divisors (80237457).

561662143 is an equidigital number, since it uses as much as digits as its factorization.

561662143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80237456.

The product of its digits is 25920, while the sum is 34.

The square root of 561662143 is about 23699.4122922911. The cubic root of 561662143 is about 825.0717503559.

The spelling of 561662143 in words is "five hundred sixty-one million, six hundred sixty-two thousand, one hundred forty-three".