561722731 has 8 divisors (see below), whose sum is σ = 564019200. Its totient is φ = 559431720.

The previous prime is 561722719. The next prime is 561722741. The reversal of 561722731 is 137227165.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 561722731 - 2¹³ = 561714539 is a prime.

It is a super-2 number, since 2×561722731² = 631064853044196722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (561722701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 438550 + ... + 439828.

It is an arithmetic number, because the mean of its divisors is an integer number (70502400).

Almost surely, 2^561722731 is an apocalyptic number.

561722731 is a deficient number, since it is larger than the sum of its proper divisors (2296469).

561722731 is a wasteful number, since it uses less digits than its factorization.

561722731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2729.

The product of its digits is 17640, while the sum is 34.

The square root of 561722731 is about 23700.6905173668. The cubic root of 561722731 is about 825.1014168559.

Adding to 561722731 its reverse (137227165), we get a palindrome (698949896).

The spelling of 561722731 in words is "five hundred sixty-one million, seven hundred twenty-two thousand, seven hundred thirty-one".