1689001639 has 4 divisors (see below), whose sum is σ = 1818924856. Its totient is φ = 1559078424.

The previous prime is 1689001583. The next prime is 1689001661. The reversal of 1689001639 is 9361009861.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9361009861 = 7 ⋅1337287123.

It is a cyclic number.

It is not a de Polignac number, because 1689001639 - 2¹⁵ = 1688968871 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1689001595 and 1689001604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1689001669) 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, 64961589 + ... + 64961614.

It is an arithmetic number, because the mean of its divisors is an integer number (454731214).

Almost surely, 2^1689001639 is an apocalyptic number.

1689001639 is a deficient number, since it is larger than the sum of its proper divisors (129923217).

1689001639 is a wasteful number, since it uses less digits than its factorization.

1689001639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129923216.

The product of its (nonzero) digits is 69984, while the sum is 43.

The square root of 1689001639 is about 41097.4651164765. The cubic root of 1689001639 is about 1190.9038255130.

The spelling of 1689001639 in words is "one billion, six hundred eighty-nine million, one thousand, six hundred thirty-nine".