561147 has 4 divisors (see below), whose sum is σ = 748200. Its totient is φ = 374096.

The previous prime is 561109. The next prime is 561161. The reversal of 561147 is 741165.

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 561147 - 2⁶ = 561083 is a prime.

It is a D-number.

It is not an unprimeable number, because it can be changed into a prime (561047) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 93522 + ... + 93527.

It is an arithmetic number, because the mean of its divisors is an integer number (187050).

2⁵⁶¹¹⁴⁷ is an apocalyptic number.

561147 is a deficient number, since it is larger than the sum of its proper divisors (187053).

561147 is a wasteful number, since it uses less digits than its factorization.

561147 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 187052.

The product of its digits is 840, while the sum is 24.

The square root of 561147 is about 749.0974569440. The cubic root of 561147 is about 82.4819427881.

The spelling of 561147 in words is "five hundred sixty-one thousand, one hundred forty-seven".