689018389 has 2 divisors, whose sum is σ = 689018390. Its totient is φ = 689018388.

The previous prime is 689018377. The next prime is 689018401. The reversal of 689018389 is 983810986.

It is a balanced prime because it is at equal distance from previous prime (689018377) and next prime (689018401).

It can be written as a sum of positive squares in only one way, i.e., 426092164 + 262926225 = 20642^2 + 16215^2 .

It is a cyclic number.

It is not a de Polignac number, because 689018389 - 2⁵ = 689018357 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (689018339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344509194 + 344509195.

It is an arithmetic number, because the mean of its divisors is an integer number (344509195).

Almost surely, 2^689018389 is an apocalyptic number.

It is an amenable number.

689018389 is a deficient number, since it is larger than the sum of its proper divisors (1).

689018389 is an equidigital number, since it uses as much as digits as its factorization.

689018389 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 746496, while the sum is 52.

The square root of 689018389 is about 26249.1597770291. The cubic root of 689018389 is about 883.2363566336.

The spelling of 689018389 in words is "six hundred eighty-nine million, eighteen thousand, three hundred eighty-nine".