561247143 has 4 divisors (see below), whose sum is σ = 748329528. Its totient is φ = 374164760.

The previous prime is 561247139. The next prime is 561247171. The reversal of 561247143 is 341742165.

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 561247143 - 2² = 561247139 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561247123) 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, 93541188 + ... + 93541193.

It is an arithmetic number, because the mean of its divisors is an integer number (187082382).

Almost surely, 2^561247143 is an apocalyptic number.

561247143 is a deficient number, since it is larger than the sum of its proper divisors (187082385).

561247143 is a wasteful number, since it uses less digits than its factorization.

561247143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187082384.

The product of its digits is 20160, while the sum is 33.

The square root of 561247143 is about 23690.6551830041. The cubic root of 561247143 is about 824.8684910673.

The spelling of 561247143 in words is "five hundred sixty-one million, two hundred forty-seven thousand, one hundred forty-three".