561280623 has 4 divisors (see below), whose sum is σ = 748374168. Its totient is φ = 374187080.

The previous prime is 561280607. The next prime is 561280633. The reversal of 561280623 is 326082165.

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 561280623 - 2⁴ = 561280607 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561280633) 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 3 ways as a sum of consecutive naturals, for example, 93546768 + ... + 93546773.

It is an arithmetic number, because the mean of its divisors is an integer number (187093542).

Almost surely, 2^561280623 is an apocalyptic number.

561280623 is a deficient number, since it is larger than the sum of its proper divisors (187093545).

561280623 is a wasteful number, since it uses less digits than its factorization.

561280623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 187093544.

The product of its (nonzero) digits is 17280, while the sum is 33.

The square root of 561280623 is about 23691.3617801932. The cubic root of 561280623 is about 824.8848926641.

The spelling of 561280623 in words is "five hundred sixty-one million, two hundred eighty thousand, six hundred twenty-three".