689439571 has 4 divisors (see below), whose sum is σ = 690996312. Its totient is φ = 687882832.

The previous prime is 689439547. The next prime is 689439577. The reversal of 689439571 is 175934986.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 689439571 - 2⁹ = 689439059 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (689439577) 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 in 3 ways as a sum of consecutive naturals, for example, 777706 + ... + 778591.

It is an arithmetic number, because the mean of its divisors is an integer number (172749078).

Almost surely, 2^689439571 is an apocalyptic number.

689439571 is a deficient number, since it is larger than the sum of its proper divisors (1556741).

689439571 is a wasteful number, since it uses less digits than its factorization.

689439571 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1556740.

The product of its digits is 1632960, while the sum is 52.

The square root of 689439571 is about 26257.1813224497. The cubic root of 689439571 is about 883.4162877199.

The spelling of 689439571 in words is "six hundred eighty-nine million, four hundred thirty-nine thousand, five hundred seventy-one".