6911621 has 2 divisors, whose sum is σ = 6911622. Its totient is φ = 6911620.

The previous prime is 6911603. The next prime is 6911627. The reversal of 6911621 is 1261196.

6911621 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., 6076225 + 835396 = 2465^2 + 914^2 .

It is a cyclic number.

It is not a de Polignac number, because 6911621 - 2¹⁰ = 6910597 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6911627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3455810 + 3455811.

It is an arithmetic number, because the mean of its divisors is an integer number (3455811).

Almost surely, 2^6911621 is an apocalyptic number.

It is an amenable number.

6911621 is a deficient number, since it is larger than the sum of its proper divisors (1).

6911621 is an equidigital number, since it uses as much as digits as its factorization.

6911621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 648, while the sum is 26.

The square root of 6911621 is about 2628.9961962696. The cubic root of 6911621 is about 190.4846445464.

The spelling of 6911621 in words is "six million, nine hundred eleven thousand, six hundred twenty-one".