1290881056891 has 4 divisors (see below), whose sum is σ = 1290891846592. Its totient is φ = 1290870267192.

The previous prime is 1290881056867. The next prime is 1290881056903. The reversal of 1290881056891 is 1986501880921.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1290881056891 - 2³⁵ = 1256521318523 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1290881056831) 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, 5213355 + ... + 5455348.

It is an arithmetic number, because the mean of its divisors is an integer number (322722961648).

Almost surely, 2^{1290881056891} is an apocalyptic number.

1290881056891 is a deficient number, since it is larger than the sum of its proper divisors (10789701).

1290881056891 is a wasteful number, since it uses less digits than its factorization.

1290881056891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10789700.

The product of its (nonzero) digits is 2488320, while the sum is 58.

The spelling of 1290881056891 in words is "one trillion, two hundred ninety billion, eight hundred eighty-one million, fifty-six thousand, eight hundred ninety-one".