561814889 has 2 divisors, whose sum is σ = 561814890. Its totient is φ = 561814888.

The previous prime is 561814867. The next prime is 561814921. The reversal of 561814889 is 988418165.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 472323289 + 89491600 = 21733^2 + 9460^2 .

It is a cyclic number.

It is not a de Polignac number, because 561814889 - 2²⁰ = 560766313 is a prime.

It is not a weakly prime, because it can be changed into another prime (561814189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280907444 + 280907445.

It is an arithmetic number, because the mean of its divisors is an integer number (280907445).

Almost surely, 2^561814889 is an apocalyptic number.

It is an amenable number.

561814889 is a deficient number, since it is larger than the sum of its proper divisors (1).

561814889 is an equidigital number, since it uses as much as digits as its factorization.

561814889 is an evil number, because the sum of its binary digits is even.

The product of its digits is 552960, while the sum is 50.

The square root of 561814889 is about 23702.6346425877. The cubic root of 561814889 is about 825.1465373006.

The spelling of 561814889 in words is "five hundred sixty-one million, eight hundred fourteen thousand, eight hundred eighty-nine".