1689085841 has 4 divisors (see below), whose sum is σ = 1689651684. Its totient is φ = 1688520000.

The previous prime is 1689085837. The next prime is 1689085907. The reversal of 1689085841 is 1485809861.

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

It can be written as a sum of positive squares in 2 ways, for example, as 479785216 + 1209300625 = 21904^2 + 34775^2 .

It is a cyclic number.

It is not a de Polignac number, because 1689085841 - 2² = 1689085837 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1689085841.

It is not an unprimeable number, because it can be changed into a prime (1689084841) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 278420 + ... + 284421.

It is an arithmetic number, because the mean of its divisors is an integer number (422412921).

Almost surely, 2^1689085841 is an apocalyptic number.

It is an amenable number.

1689085841 is a deficient number, since it is larger than the sum of its proper divisors (565843).

1689085841 is an equidigital number, since it uses as much as digits as its factorization.

1689085841 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 565842.

The product of its (nonzero) digits is 552960, while the sum is 50.

The square root of 1689085841 is about 41098.4895221223. The cubic root of 1689085841 is about 1190.9236152742.

The spelling of 1689085841 in words is "one billion, six hundred eighty-nine million, eighty-five thousand, eight hundred forty-one".