108642689 has 2 divisors, whose sum is σ = 108642690. Its totient is φ = 108642688.

The previous prime is 108642679. The next prime is 108642691. The reversal of 108642689 is 986246801.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 102921025 + 5721664 = 10145^2 + 2392^2 .

It is a cyclic number.

It is not a de Polignac number, because 108642689 - 2⁸ = 108642433 is a prime.

Together with 108642691, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (108642679) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54321344 + 54321345.

It is an arithmetic number, because the mean of its divisors is an integer number (54321345).

Almost surely, 2^108642689 is an apocalyptic number.

It is an amenable number.

108642689 is a deficient number, since it is larger than the sum of its proper divisors (1).

108642689 is an equidigital number, since it uses as much as digits as its factorization.

108642689 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 165888, while the sum is 44.

The square root of 108642689 is about 10423.1803687742. The cubic root of 108642689 is about 477.1630824158.

The spelling of 108642689 in words is "one hundred eight million, six hundred forty-two thousand, six hundred eighty-nine".