6719621 has 2 divisors, whose sum is σ = 6719622. Its totient is φ = 6719620.

The previous prime is 6719593. The next prime is 6719623. The reversal of 6719621 is 1269176.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5313025 + 1406596 = 2305^2 + 1186^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6719621 is a prime.

Together with 6719623, 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 (6719623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3359810 + 3359811.

It is an arithmetic number, because the mean of its divisors is an integer number (3359811).

Almost surely, 2^6719621 is an apocalyptic number.

It is an amenable number.

6719621 is a deficient number, since it is larger than the sum of its proper divisors (1).

6719621 is an equidigital number, since it uses as much as digits as its factorization.

6719621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4536, while the sum is 32.

The square root of 6719621 is about 2592.2231771204. The cubic root of 6719621 is about 188.7042115150.

The spelling of 6719621 in words is "six million, seven hundred nineteen thousand, six hundred twenty-one".