561445487 has 2 divisors, whose sum is σ = 561445488. Its totient is φ = 561445486.

The previous prime is 561445477. The next prime is 561445523. The reversal of 561445487 is 784544165.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 561445487 - 2⁴ = 561445471 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (561445447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280722743 + 280722744.

It is an arithmetic number, because the mean of its divisors is an integer number (280722744).

Almost surely, 2^561445487 is an apocalyptic number.

561445487 is a deficient number, since it is larger than the sum of its proper divisors (1).

561445487 is an equidigital number, since it uses as much as digits as its factorization.

561445487 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 537600, while the sum is 44.

The square root of 561445487 is about 23694.8409363726. The cubic root of 561445487 is about 824.9656487687.

The spelling of 561445487 in words is "five hundred sixty-one million, four hundred forty-five thousand, four hundred eighty-seven".