5531621 has 2 divisors, whose sum is σ = 5531622. Its totient is φ = 5531620.

The previous prime is 5531599. The next prime is 5531623. The reversal of 5531621 is 1261355.

5531621 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4452100 + 1079521 = 2110^2 + 1039^2 .

It is a cyclic number.

It is not a de Polignac number, because 5531621 - 2²² = 1337317 is a prime.

Together with 5531623, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5531623) 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 as a sum of consecutive naturals, namely, 2765810 + 2765811.

It is an arithmetic number, because the mean of its divisors is an integer number (2765811).

Almost surely, 2^5531621 is an apocalyptic number.

It is an amenable number.

5531621 is a deficient number, since it is larger than the sum of its proper divisors (1).

5531621 is an equidigital number, since it uses as much as digits as its factorization.

5531621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 900, while the sum is 23.

The square root of 5531621 is about 2351.9398376659. The cubic root of 5531621 is about 176.8550527935.

Adding to 5531621 its reverse (1261355), we get a palindrome (6792976).

The spelling of 5531621 in words is "five million, five hundred thirty-one thousand, six hundred twenty-one".