2891979927881 has 12 divisors (see below), whose sum is σ = 3288401232900. Its totient is φ = 2538414980640.

The previous prime is 2891979927857. The next prime is 2891979927911. The reversal of 2891979927881 is 1887299791982.

It can be written as a sum of positive squares in 2 ways, for example, as 1180082451856 + 1711897476025 = 1086316^2 + 1308395^2 .

It is a de Polignac number, because none of the positive numbers 2^k-2891979927881 is a prime.

It is a super-2 number, since 2×2891979927881² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2891979927796 and 2891979927805.

It is not an unprimeable number, because it can be changed into a prime (2891979927581) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 412076846 + ... + 412083863.

It is an arithmetic number, because the mean of its divisors is an integer number (274033436075).

Almost surely, 2^{2891979927881} is an apocalyptic number.

It is an amenable number.

2891979927881 is a deficient number, since it is larger than the sum of its proper divisors (396421305019).

2891979927881 is a wasteful number, since it uses less digits than its factorization.

2891979927881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 824160760 (or 824160749 counting only the distinct ones).

The product of its digits is 658409472, while the sum is 80.

The spelling of 2891979927881 in words is "two trillion, eight hundred ninety-one billion, nine hundred seventy-nine million, nine hundred twenty-seven thousand, eight hundred eighty-one".