561172289 has 4 divisors (see below), whose sum is σ = 574859460. Its totient is φ = 547485120.

The previous prime is 561172259. The next prime is 561172291. The reversal of 561172289 is 982271165.

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

It can be written as a sum of positive squares in 2 ways, for example, as 74528689 + 486643600 = 8633^2 + 22060^2 .

It is a cyclic number.

It is not a de Polignac number, because 561172289 - 2¹² = 561168193 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (41), and also a Moran number because the ratio is a prime number: 13687129 = 561172289 / (5 + 6 + 1 + 1 + 7 + 2 + 2 + 8 + 9).

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (561172259) 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, 6843524 + ... + 6843605.

It is an arithmetic number, because the mean of its divisors is an integer number (143714865).

Almost surely, 2^561172289 is an apocalyptic number.

It is an amenable number.

561172289 is a deficient number, since it is larger than the sum of its proper divisors (13687171).

561172289 is a wasteful number, since it uses less digits than its factorization.

561172289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13687170.

The product of its digits is 60480, while the sum is 41.

The square root of 561172289 is about 23689.0753090955. The cubic root of 561172289 is about 824.8318183039.

The spelling of 561172289 in words is "five hundred sixty-one million, one hundred seventy-two thousand, two hundred eighty-nine".