108991579 has 2 divisors, whose sum is σ = 108991580. Its totient is φ = 108991578.

The previous prime is 108991517. The next prime is 108991601. The reversal of 108991579 is 975199801.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 108991579 - 2⁷ = 108991451 is a prime.

It is not a weakly prime, because it can be changed into another prime (108991279) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54495789 + 54495790.

It is an arithmetic number, because the mean of its divisors is an integer number (54495790).

Almost surely, 2^108991579 is an apocalyptic number.

108991579 is a deficient number, since it is larger than the sum of its proper divisors (1).

108991579 is an equidigital number, since it uses as much as digits as its factorization.

108991579 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 204120, while the sum is 49.

The square root of 108991579 is about 10439.9032083636. The cubic root of 108991579 is about 477.6733162864.

The spelling of 108991579 in words is "one hundred eight million, nine hundred ninety-one thousand, five hundred seventy-nine".