561965849 has 2 divisors, whose sum is σ = 561965850. Its totient is φ = 561965848.

The previous prime is 561965843. The next prime is 561965881. The reversal of 561965849 is 948569165.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 385926025 + 176039824 = 19645^2 + 13268^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-561965849 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 561965849.

It is not a weakly prime, because it can be changed into another prime (561965843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280982924 + 280982925.

It is an arithmetic number, because the mean of its divisors is an integer number (280982925).

Almost surely, 2^561965849 is an apocalyptic number.

It is an amenable number.

561965849 is a deficient number, since it is larger than the sum of its proper divisors (1).

561965849 is an equidigital number, since it uses as much as digits as its factorization.

561965849 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2332800, while the sum is 53.

The square root of 561965849 is about 23705.8188848224. The cubic root of 561965849 is about 825.2204364731.

The spelling of 561965849 in words is "five hundred sixty-one million, nine hundred sixty-five thousand, eight hundred forty-nine".