5691881 has 4 divisors (see below), whose sum is σ = 6129732. Its totient is φ = 5254032.

The previous prime is 5691877. The next prime is 5691893. The reversal of 5691881 is 1881965.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1881965 = 5 ⋅376393.

It can be written as a sum of positive squares in 2 ways, for example, as 1755625 + 3936256 = 1325^2 + 1984^2 .

It is a cyclic number.

It is not a de Polignac number, because 5691881 - 2² = 5691877 is a prime.

It is a super-2 number, since 2×5691881² = 64795018636322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5693881) 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, 218906 + ... + 218931.

It is an arithmetic number, because the mean of its divisors is an integer number (1532433).

Almost surely, 2^5691881 is an apocalyptic number.

It is an amenable number.

5691881 is a deficient number, since it is larger than the sum of its proper divisors (437851).

5691881 is a wasteful number, since it uses less digits than its factorization.

5691881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 437850.

The product of its digits is 17280, while the sum is 38.

The square root of 5691881 is about 2385.7663339062. The cubic root of 5691881 is about 178.5467450225.

The spelling of 5691881 in words is "five million, six hundred ninety-one thousand, eight hundred eighty-one".