561906487 has 2 divisors, whose sum is σ = 561906488. Its totient is φ = 561906486.

The previous prime is 561906473. The next prime is 561906497. The reversal of 561906487 is 784609165.

561906487 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 a de Polignac number, because none of the positive numbers 2^k-561906487 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (561906467) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280953243 + 280953244.

It is an arithmetic number, because the mean of its divisors is an integer number (280953244).

Almost surely, 2^561906487 is an apocalyptic number.

561906487 is a deficient number, since it is larger than the sum of its proper divisors (1).

561906487 is an equidigital number, since it uses as much as digits as its factorization.

561906487 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 362880, while the sum is 46.

The square root of 561906487 is about 23704.5667962948. The cubic root of 561906487 is about 825.1913786809.

The spelling of 561906487 in words is "five hundred sixty-one million, nine hundred six thousand, four hundred eighty-seven".