1289847180961 has 4 divisors (see below), whose sum is σ = 1298389215424. Its totient is φ = 1281305146500.

The previous prime is 1289847180917. The next prime is 1289847181061. The reversal of 1289847180961 is 1690817489821.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1289847180961 - 2¹⁷ = 1289847049889 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1289847180893 and 1289847180902.

It is not an unprimeable number, because it can be changed into a prime (1289847187961) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4271017005 + ... + 4271017306.

It is an arithmetic number, because the mean of its divisors is an integer number (324597303856).

Almost surely, 2^{1289847180961} is an apocalyptic number.

It is an amenable number.

1289847180961 is a deficient number, since it is larger than the sum of its proper divisors (8542034463).

1289847180961 is an equidigital number, since it uses as much as digits as its factorization.

1289847180961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8542034462.

The product of its (nonzero) digits is 13934592, while the sum is 64.

The spelling of 1289847180961 in words is "one trillion, two hundred eighty-nine billion, eight hundred forty-seven million, one hundred eighty thousand, nine hundred sixty-one".