7118921 has 2 divisors, whose sum is σ = 7118922. Its totient is φ = 7118920.

The previous prime is 7118897. The next prime is 7118963. The reversal of 7118921 is 1298117.

7118921 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6446521 + 672400 = 2539^2 + 820^2 .

It is an emirp because it is prime and its reverse (1298117) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7118921 - 2⁶ = 7118857 is a prime.

It is not a weakly prime, because it can be changed into another prime (7115921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3559460 + 3559461.

It is an arithmetic number, because the mean of its divisors is an integer number (3559461).

Almost surely, 2^7118921 is an apocalyptic number.

It is an amenable number.

7118921 is a deficient number, since it is larger than the sum of its proper divisors (1).

7118921 is an equidigital number, since it uses as much as digits as its factorization.

7118921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1008, while the sum is 29.

The square root of 7118921 is about 2668.1306189915. The cubic root of 7118921 is about 192.3703157568.

The spelling of 7118921 in words is "seven million, one hundred eighteen thousand, nine hundred twenty-one".