5640881 has 2 divisors, whose sum is σ = 5640882. Its totient is φ = 5640880.

The previous prime is 5640871. The next prime is 5640883. The reversal of 5640881 is 1880465.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5640625 + 256 = 2375^2 + 16^2 .

It is a cyclic number.

It is not a de Polignac number, because 5640881 - 2¹⁰ = 5639857 is a prime.

It is a super-2 number, since 2×5640881² = 63639076912322, which contains 22 as substring.

Together with 5640883, it forms a pair of twin primes.

It is a Chen prime.

It is a plaindrome in base 13.

It is not a weakly prime, because it can be changed into another prime (5640883) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2820440 + 2820441.

It is an arithmetic number, because the mean of its divisors is an integer number (2820441).

Almost surely, 2^5640881 is an apocalyptic number.

It is an amenable number.

5640881 is a deficient number, since it is larger than the sum of its proper divisors (1).

5640881 is an equidigital number, since it uses as much as digits as its factorization.

5640881 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7680, while the sum is 32.

The square root of 5640881 is about 2375.0538941254. The cubic root of 5640881 is about 178.0118769165.

The spelling of 5640881 in words is "five million, six hundred forty thousand, eight hundred eighty-one".