5649981 has 8 divisors (see below), whose sum is σ = 7636800. Its totient is φ = 3714912.

The previous prime is 5649977. The next prime is 5649997. The reversal of 5649981 is 1899465.

5649981 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 5649981 - 2² = 5649977 is a prime.

It is a super-2 number, since 2×5649981² = 63844570600722, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5649901) 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 7 ways as a sum of consecutive naturals, for example, 12681 + ... + 13118.

It is an arithmetic number, because the mean of its divisors is an integer number (954600).

Almost surely, 2^5649981 is an apocalyptic number.

It is an amenable number.

5649981 is a deficient number, since it is larger than the sum of its proper divisors (1986819).

5649981 is a wasteful number, since it uses less digits than its factorization.

5649981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25875.

The product of its digits is 77760, while the sum is 42.

The square root of 5649981 is about 2376.9688681175. The cubic root of 5649981 is about 178.1075497833.

The spelling of 5649981 in words is "five million, six hundred forty-nine thousand, nine hundred eighty-one".