561172345 has 8 divisors (see below), whose sum is σ = 676298376. Its totient is φ = 447010176.

The previous prime is 561172343. The next prime is 561172357. The reversal of 561172345 is 543271165.

It can be written as a sum of positive squares in 4 ways, for example, as 129322384 + 431849961 = 11372^2 + 20781^2 .

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 561172345 - 2¹ = 561172343 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 561172345.

It is not an unprimeable number, because it can be changed into a prime (561172343) 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, 239682 + ... + 242011.

It is an arithmetic number, because the mean of its divisors is an integer number (84537297).

Almost surely, 2^561172345 is an apocalyptic number.

It is an amenable number.

561172345 is a deficient number, since it is larger than the sum of its proper divisors (115126031).

561172345 is a wasteful number, since it uses less digits than its factorization.

561172345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 481931.

The product of its digits is 25200, while the sum is 34.

The square root of 561172345 is about 23689.0764910750. The cubic root of 561172345 is about 824.8318457408.

The spelling of 561172345 in words is "five hundred sixty-one million, one hundred seventy-two thousand, three hundred forty-five".