561655275 has 12 divisors (see below), whose sum is σ = 928603512. Its totient is φ = 299549440.

The previous prime is 561655271. The next prime is 561655277. The reversal of 561655275 is 572556165.

It is a happy number.

It is not a de Polignac number, because 561655275 - 2² = 561655271 is a prime.

It is not an unprimeable number, because it can be changed into a prime (561655271) 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 11 ways as a sum of consecutive naturals, for example, 3744294 + ... + 3744443.

It is an arithmetic number, because the mean of its divisors is an integer number (77383626).

Almost surely, 2^561655275 is an apocalyptic number.

561655275 is a deficient number, since it is larger than the sum of its proper divisors (366948237).

561655275 is a wasteful number, since it uses less digits than its factorization.

561655275 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7488750 (or 7488745 counting only the distinct ones).

The product of its digits is 315000, while the sum is 42.

The square root of 561655275 is about 23699.2673937403. The cubic root of 561655275 is about 825.0683873521.

The spelling of 561655275 in words is "five hundred sixty-one million, six hundred fifty-five thousand, two hundred seventy-five".