5655981 has 16 divisors (see below), whose sum is σ = 7920128. Its totient is φ = 3585600.

The previous prime is 5655961. The next prime is 5655997. The reversal of 5655981 is 1895565.

It is not a de Polignac number, because 5655981 - 2⁹ = 5655469 is a prime.

It is a super-2 number, since 2×5655981² = 63980242144722, which contains 22 as substring.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5655911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5175 + ... + 6171.

It is an arithmetic number, because the mean of its divisors is an integer number (495008).

Almost surely, 2^5655981 is an apocalyptic number.

It is an amenable number.

5655981 is a deficient number, since it is larger than the sum of its proper divisors (2264147).

5655981 is a wasteful number, since it uses less digits than its factorization.

5655981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1092.

The product of its digits is 54000, while the sum is 39.

The square root of 5655981 is about 2378.2306448282. The cubic root of 5655981 is about 178.1705746111.

The spelling of 5655981 in words is "five million, six hundred fifty-five thousand, nine hundred eighty-one".