561722691 has 8 divisors (see below), whose sum is σ = 752178960. Its totient is φ = 372874112.

The previous prime is 561722659. The next prime is 561722701. The reversal of 561722691 is 196227165.

561722691 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 561722691 - 2⁵ = 561722659 is a prime.

It is not an unprimeable number, because it can be changed into a prime (561722611) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 401106 + ... + 402503.

It is an arithmetic number, because the mean of its divisors is an integer number (94022370).

Almost surely, 2^561722691 is an apocalyptic number.

561722691 is a deficient number, since it is larger than the sum of its proper divisors (190456269).

561722691 is a wasteful number, since it uses less digits than its factorization.

561722691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 803845.

The product of its digits is 45360, while the sum is 39.

The square root of 561722691 is about 23700.6896735095. The cubic root of 561722691 is about 825.1013972709.

The spelling of 561722691 in words is "five hundred sixty-one million, seven hundred twenty-two thousand, six hundred ninety-one".