689049921 has 16 divisors (see below), whose sum is σ = 1056673664. Its totient is φ = 391233024.

The previous prime is 689049919. The next prime is 689049937. The reversal of 689049921 is 129940986.

It is not a de Polignac number, because 689049921 - 2¹ = 689049919 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (689049941) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 101200 + ... + 107793.

It is an arithmetic number, because the mean of its divisors is an integer number (66042104).

Almost surely, 2^689049921 is an apocalyptic number.

It is an amenable number.

689049921 is a deficient number, since it is larger than the sum of its proper divisors (367623743).

689049921 is a wasteful number, since it uses less digits than its factorization.

689049921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 209160.

The product of its (nonzero) digits is 279936, while the sum is 48.

The square root of 689049921 is about 26249.7603989065. The cubic root of 689049921 is about 883.2498298028.

The spelling of 689049921 in words is "six hundred eighty-nine million, forty-nine thousand, nine hundred twenty-one".