1944169561 has 2 divisors, whose sum is σ = 1944169562. Its totient is φ = 1944169560.

The previous prime is 1944169543. The next prime is 1944169573. The reversal of 1944169561 is 1659614491.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1351003536 + 593166025 = 36756^2 + 24355^2 .

It is a cyclic number.

It is not a de Polignac number, because 1944169561 - 2⁹ = 1944169049 is a prime.

It is not a weakly prime, because it can be changed into another prime (1944169501) 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, 972084780 + 972084781.

It is an arithmetic number, because the mean of its divisors is an integer number (972084781).

Almost surely, 2^1944169561 is an apocalyptic number.

It is an amenable number.

1944169561 is a deficient number, since it is larger than the sum of its proper divisors (1).

1944169561 is an equidigital number, since it uses as much as digits as its factorization.

1944169561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 233280, while the sum is 46.

The square root of 1944169561 is about 44092.7381889581. The cubic root of 1944169561 is about 1248.0865788969.

The spelling of 1944169561 in words is "one billion, nine hundred forty-four million, one hundred sixty-nine thousand, five hundred sixty-one".