689159123 has 2 divisors, whose sum is σ = 689159124. Its totient is φ = 689159122.

The previous prime is 689159113. The next prime is 689159131. The reversal of 689159123 is 321951986.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-689159123 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (689159113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344579561 + 344579562.

It is an arithmetic number, because the mean of its divisors is an integer number (344579562).

Almost surely, 2^689159123 is an apocalyptic number.

689159123 is a deficient number, since it is larger than the sum of its proper divisors (1).

689159123 is an equidigital number, since it uses as much as digits as its factorization.

689159123 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 116640, while the sum is 44.

The square root of 689159123 is about 26251.8403735814. The cubic root of 689159123 is about 883.2964870672.

The spelling of 689159123 in words is "six hundred eighty-nine million, one hundred fifty-nine thousand, one hundred twenty-three".