7168991 has 2 divisors, whose sum is σ = 7168992. Its totient is φ = 7168990.

The previous prime is 7168981. The next prime is 7168999. The reversal of 7168991 is 1998617.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (1998617) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7168991 - 2⁶ = 7168927 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7168999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3584495 + 3584496.

It is an arithmetic number, because the mean of its divisors is an integer number (3584496).

Almost surely, 2^7168991 is an apocalyptic number.

7168991 is a deficient number, since it is larger than the sum of its proper divisors (1).

7168991 is an equidigital number, since it uses as much as digits as its factorization.

7168991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27216, while the sum is 41.

The square root of 7168991 is about 2677.4971521927. The cubic root of 7168991 is about 192.8202663309.

The spelling of 7168991 in words is "seven million, one hundred sixty-eight thousand, nine hundred ninety-one".