689555459 has 2 divisors, whose sum is σ = 689555460. Its totient is φ = 689555458.

The previous prime is 689555453. The next prime is 689555521. The reversal of 689555459 is 954555986.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 689555459 - 2²⁴ = 672778243 is a prime.

It is not a weakly prime, because it can be changed into another prime (689555453) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344777729 + 344777730.

It is an arithmetic number, because the mean of its divisors is an integer number (344777730).

Almost surely, 2^689555459 is an apocalyptic number.

689555459 is a deficient number, since it is larger than the sum of its proper divisors (1).

689555459 is an equidigital number, since it uses as much as digits as its factorization.

689555459 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9720000, while the sum is 56.

The square root of 689555459 is about 26259.3880164790. The cubic root of 689555459 is about 883.4657828052.

The spelling of 689555459 in words is "six hundred eighty-nine million, five hundred fifty-five thousand, four hundred fifty-nine".