1689208919 has 4 divisors (see below), whose sum is σ = 1689379344. Its totient is φ = 1689038496.

The previous prime is 1689208877. The next prime is 1689208931. The reversal of 1689208919 is 9198029861.

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 1689208919 - 2²⁸ = 1420773463 is a prime.

It is a super-2 number, since 2×1689208919² = 5706853544058297122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1689208019) 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, 69362 + ... + 90495.

It is an arithmetic number, because the mean of its divisors is an integer number (422344836).

Almost surely, 2^1689208919 is an apocalyptic number.

1689208919 is a deficient number, since it is larger than the sum of its proper divisors (170425).

1689208919 is a wasteful number, since it uses less digits than its factorization.

1689208919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170424.

The product of its (nonzero) digits is 559872, while the sum is 53.

The square root of 1689208919 is about 41099.9868491463. The cubic root of 1689208919 is about 1190.9525407701.

The spelling of 1689208919 in words is "one billion, six hundred eighty-nine million, two hundred eight thousand, nine hundred nineteen".