561117731 has 4 divisors (see below), whose sum is σ = 571704912. Its totient is φ = 550530552.

The previous prime is 561117727. The next prime is 561117749. The reversal of 561117731 is 137711165.

561117731 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 561117731 - 2² = 561117727 is a prime.

It is a super-2 number, since 2×561117731² = 629706216085176722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (561117761) 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, 5293511 + ... + 5293616.

It is an arithmetic number, because the mean of its divisors is an integer number (142926228).

Almost surely, 2^561117731 is an apocalyptic number.

561117731 is a deficient number, since it is larger than the sum of its proper divisors (10587181).

561117731 is a wasteful number, since it uses less digits than its factorization.

561117731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10587180.

The product of its digits is 4410, while the sum is 32.

The square root of 561117731 is about 23687.9237376348. The cubic root of 561117731 is about 824.8050869811.

Adding to 561117731 its reverse (137711165), we get a palindrome (698828896).

The spelling of 561117731 in words is "five hundred sixty-one million, one hundred seventeen thousand, seven hundred thirty-one".