7921169 has 2 divisors, whose sum is σ = 7921170. Its totient is φ = 7921168.

The previous prime is 7921153. The next prime is 7921171. The reversal of 7921169 is 9611297.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7772944 + 148225 = 2788^2 + 385^2 .

It is an emirp because it is prime and its reverse (9611297) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7921169 - 2⁴ = 7921153 is a prime.

It is a super-2 number, since 2×7921169² = 125489836653122, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 7921171, it forms a pair of twin primes.

It is a Chen prime.

It is an Ulam number.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (7921129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3960584 + 3960585.

It is an arithmetic number, because the mean of its divisors is an integer number (3960585).

Almost surely, 2^7921169 is an apocalyptic number.

It is an amenable number.

7921169 is a deficient number, since it is larger than the sum of its proper divisors (1).

7921169 is an equidigital number, since it uses as much as digits as its factorization.

7921169 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6804, while the sum is 35.

The square root of 7921169 is about 2814.4571412619. The cubic root of 7921169 is about 199.3409053572.

It can be divided in two parts, 7921 and 169, that multiplied together give a square (1338649 = 1157²).

The spelling of 7921169 in words is "seven million, nine hundred twenty-one thousand, one hundred sixty-nine".