8118991 has 2 divisors, whose sum is σ = 8118992. Its totient is φ = 8118990.

The previous prime is 8118973. The next prime is 8119009. The reversal of 8118991 is 1998118.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (8118973) and next prime (8119009).

It is a cyclic number.

It is not a de Polignac number, because 8118991 - 2⁷ = 8118863 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 8118991.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8118191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4059495 + 4059496.

It is an arithmetic number, because the mean of its divisors is an integer number (4059496).

Almost surely, 2^8118991 is an apocalyptic number.

8118991 is a deficient number, since it is larger than the sum of its proper divisors (1).

8118991 is an equidigital number, since it uses as much as digits as its factorization.

8118991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5184, while the sum is 37.

The square root of 8118991 is about 2849.3843194627. The cubic root of 8118991 is about 200.9867156225.

The spelling of 8118991 in words is "eight million, one hundred eighteen thousand, nine hundred ninety-one".