7171621 has 2 divisors, whose sum is σ = 7171622. Its totient is φ = 7171620.

The previous prime is 7171579. The next prime is 7171651. The reversal of 7171621 is 1261717.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5239521 + 1932100 = 2289^2 + 1390^2 .

It is an emirp because it is prime and its reverse (1261717) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7171621 - 2¹⁵ = 7138853 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7171651) 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, 3585810 + 3585811.

It is an arithmetic number, because the mean of its divisors is an integer number (3585811).

Almost surely, 2^7171621 is an apocalyptic number.

It is an amenable number.

7171621 is a deficient number, since it is larger than the sum of its proper divisors (1).

7171621 is an equidigital number, since it uses as much as digits as its factorization.

7171621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 588, while the sum is 25.

The square root of 7171621 is about 2677.9882374648. The cubic root of 7171621 is about 192.8438426519.

The spelling of 7171621 in words is "seven million, one hundred seventy-one thousand, six hundred twenty-one".