561818239 has 8 divisors (see below), whose sum is σ = 610465280. Its totient is φ = 515079000.

The previous prime is 561818207. The next prime is 561818251. The reversal of 561818239 is 932818165.

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 561818239 - 2⁵ = 561818207 is a prime.

It is a super-2 number, since 2×561818239² = 631279467346122242, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 561818195 and 561818204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561818339) 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, 476337 + ... + 477514.

It is an arithmetic number, because the mean of its divisors is an integer number (76308160).

Almost surely, 2^561818239 is an apocalyptic number.

561818239 is a deficient number, since it is larger than the sum of its proper divisors (48647041).

561818239 is a wasteful number, since it uses less digits than its factorization.

561818239 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 953901.

The product of its digits is 103680, while the sum is 43.

The square root of 561818239 is about 23702.7053097321. The cubic root of 561818239 is about 825.1481773636.

The spelling of 561818239 in words is "five hundred sixty-one million, eight hundred eighteen thousand, two hundred thirty-nine".