561247 has 4 divisors (see below), whose sum is σ = 566800. Its totient is φ = 555696.

The previous prime is 561229. The next prime is 561251. The reversal of 561247 is 742165.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-561247 is a prime.

It is a Duffinian number.

561247 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561277) 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, 2622 + ... + 2827.

It is an arithmetic number, because the mean of its divisors is an integer number (141700).

2⁵⁶¹²⁴⁷ is an apocalyptic number.

561247 is a deficient number, since it is larger than the sum of its proper divisors (5553).

561247 is a wasteful number, since it uses less digits than its factorization.

561247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5552.

The product of its digits is 1680, while the sum is 25.

The square root of 561247 is about 749.1642009600. The cubic root of 561247 is about 82.4868421011.

It can be divided in two parts, 561 and 247, that added together give a palindrome (808).

The spelling of 561247 in words is "five hundred sixty-one thousand, two hundred forty-seven".