8991679 has 2 divisors, whose sum is σ = 8991680. Its totient is φ = 8991678.

The previous prime is 8991667. The next prime is 8991713. The reversal of 8991679 is 9761998.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 8991679 - 2⁹ = 8991167 is a prime.

It is a Chen prime.

8991679 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8991649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4495839 + 4495840.

It is an arithmetic number, because the mean of its divisors is an integer number (4495840).

Almost surely, 2^8991679 is an apocalyptic number.

8991679 is a deficient number, since it is larger than the sum of its proper divisors (1).

8991679 is an equidigital number, since it uses as much as digits as its factorization.

8991679 is an evil number, because the sum of its binary digits is even.

The product of its digits is 244944, while the sum is 49.

The square root of 8991679 is about 2998.6128459673. The cubic root of 8991679 is about 207.9442574370.

The spelling of 8991679 in words is "eight million, nine hundred ninety-one thousand, six hundred seventy-nine".