561897563 has 2 divisors, whose sum is σ = 561897564. Its totient is φ = 561897562.

The previous prime is 561897551. The next prime is 561897587. The reversal of 561897563 is 365798165.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 561897563 - 2⁶ = 561897499 is a prime.

It is not a weakly prime, because it can be changed into another prime (561897463) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280948781 + 280948782.

It is an arithmetic number, because the mean of its divisors is an integer number (280948782).

Almost surely, 2^561897563 is an apocalyptic number.

561897563 is a deficient number, since it is larger than the sum of its proper divisors (1).

561897563 is an equidigital number, since it uses as much as digits as its factorization.

561897563 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1360800, while the sum is 50.

The square root of 561897563 is about 23704.3785617763. The cubic root of 561897563 is about 825.1870101920.

The spelling of 561897563 in words is "five hundred sixty-one million, eight hundred ninety-seven thousand, five hundred sixty-three".