561242147 has 2 divisors, whose sum is σ = 561242148. Its totient is φ = 561242146.

The previous prime is 561242141. The next prime is 561242173. The reversal of 561242147 is 741242165.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 561242147 - 2¹⁶ = 561176611 is a prime.

It is not a weakly prime, because it can be changed into another prime (561242141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280621073 + 280621074.

It is an arithmetic number, because the mean of its divisors is an integer number (280621074).

Almost surely, 2^561242147 is an apocalyptic number.

561242147 is a deficient number, since it is larger than the sum of its proper divisors (1).

561242147 is an equidigital number, since it uses as much as digits as its factorization.

561242147 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13440, while the sum is 32.

The square root of 561242147 is about 23690.5497403501. The cubic root of 561242147 is about 824.8660435091.

The spelling of 561242147 in words is "five hundred sixty-one million, two hundred forty-two thousand, one hundred forty-seven".