8991667 has 2 divisors, whose sum is σ = 8991668. Its totient is φ = 8991666.

The previous prime is 8991649. The next prime is 8991679. The reversal of 8991667 is 7661998.

8991667 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 8991667 - 2⁷ = 8991539 is a prime.

It is not a weakly prime, because it can be changed into another prime (8991607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4495833 + 4495834.

It is an arithmetic number, because the mean of its divisors is an integer number (4495834).

Almost surely, 2^8991667 is an apocalyptic number.

8991667 is a deficient number, since it is larger than the sum of its proper divisors (1).

8991667 is an equidigital number, since it uses as much as digits as its factorization.

8991667 is an evil number, because the sum of its binary digits is even.

The product of its digits is 163296, while the sum is 46.

The square root of 8991667 is about 2998.6108450414. The cubic root of 8991667 is about 207.9441649317.

The spelling of 8991667 in words is "eight million, nine hundred ninety-one thousand, six hundred sixty-seven".