689001779 has 4 divisors (see below), whose sum is σ = 689562720. Its totient is φ = 688440840.

The previous prime is 689001773. The next prime is 689001799. The reversal of 689001779 is 977100986.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 977100986 = 2 ⋅488550493.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-689001779 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (689001773) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 278624 + ... + 281085.

It is an arithmetic number, because the mean of its divisors is an integer number (172390680).

Almost surely, 2^689001779 is an apocalyptic number.

689001779 is a deficient number, since it is larger than the sum of its proper divisors (560941).

689001779 is a wasteful number, since it uses less digits than its factorization.

689001779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 560940.

The product of its (nonzero) digits is 190512, while the sum is 47.

The square root of 689001779 is about 26248.8433840427. The cubic root of 689001779 is about 883.2292592547.

The spelling of 689001779 in words is "six hundred eighty-nine million, one thousand, seven hundred seventy-nine".