5681621 has 16 divisors (see below), whose sum is σ = 6853248. Its totient is φ = 4646400.

The previous prime is 5681617. The next prime is 5681623. The reversal of 5681621 is 1261865.

It is a happy number.

5681621 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 5681621 - 2² = 5681617 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5681623) 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, 3641 + ... + 4961.

It is an arithmetic number, because the mean of its divisors is an integer number (428328).

Almost surely, 2^5681621 is an apocalyptic number.

It is an amenable number.

5681621 is a deficient number, since it is larger than the sum of its proper divisors (1171627).

5681621 is a wasteful number, since it uses less digits than its factorization.

5681621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1372.

The product of its digits is 2880, while the sum is 29.

The square root of 5681621 is about 2383.6151115480. The cubic root of 5681621 is about 178.4393996412.

It can be divided in two parts, 56 and 81621, that multiplied together give a triangular number (4570776 = T₃₀₂₃).

The spelling of 5681621 in words is "five million, six hundred eighty-one thousand, six hundred twenty-one".