7171318621 has 4 divisors (see below), whose sum is σ = 7418605500. Its totient is φ = 6924031744.

The previous prime is 7171318619. The next prime is 7171318633. The reversal of 7171318621 is 1268131717.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3045825721 + 4125492900 = 55189^2 + 64230^2 .

It is a cyclic number.

It is not a de Polignac number, because 7171318621 - 2¹ = 7171318619 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7171318681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 123643396 + ... + 123643453.

It is an arithmetic number, because the mean of its divisors is an integer number (1854651375).

Almost surely, 2^7171318621 is an apocalyptic number.

It is an amenable number.

7171318621 is a deficient number, since it is larger than the sum of its proper divisors (247286879).

7171318621 is a wasteful number, since it uses less digits than its factorization.

7171318621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 247286878.

The product of its digits is 14112, while the sum is 37.

The square root of 7171318621 is about 84683.6384492306. The cubic root of 7171318621 is about 1928.4113230477.

The spelling of 7171318621 in words is "seven billion, one hundred seventy-one million, three hundred eighteen thousand, six hundred twenty-one".