561605507 has 2 divisors, whose sum is σ = 561605508. Its totient is φ = 561605506.

The previous prime is 561605497. The next prime is 561605509. The reversal of 561605507 is 705506165.

561605507 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 561605507 - 2²⁶ = 494496643 is a prime.

Together with 561605509, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (561605509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280802753 + 280802754.

It is an arithmetic number, because the mean of its divisors is an integer number (280802754).

Almost surely, 2^561605507 is an apocalyptic number.

561605507 is a deficient number, since it is larger than the sum of its proper divisors (1).

561605507 is an equidigital number, since it uses as much as digits as its factorization.

561605507 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 31500, while the sum is 35.

The square root of 561605507 is about 23698.2173802166. The cubic root of 561605507 is about 825.0440169964.

The spelling of 561605507 in words is "five hundred sixty-one million, six hundred five thousand, five hundred seven".