1961089589489 has 2 divisors, whose sum is σ = 1961089589490. Its totient is φ = 1961089589488.

The previous prime is 1961089589471. The next prime is 1961089589527. The reversal of 1961089589489 is 9849859801691.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1868196912400 + 92892677089 = 1366820^2 + 304783^2 .

It is a cyclic number.

It is not a de Polignac number, because 1961089589489 - 2²⁴ = 1961072812273 is a prime.

It is a super-2 number, since 2×1961089589489² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1961089589689) 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, 980544794744 + 980544794745.

It is an arithmetic number, because the mean of its divisors is an integer number (980544794745).

Almost surely, 2^{1961089589489} is an apocalyptic number.

It is an amenable number.

1961089589489 is a deficient number, since it is larger than the sum of its proper divisors (1).

1961089589489 is an equidigital number, since it uses as much as digits as its factorization.

1961089589489 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 403107840, while the sum is 77.

The spelling of 1961089589489 in words is "one trillion, nine hundred sixty-one billion, eighty-nine million, five hundred eighty-nine thousand, four hundred eighty-nine".