1691916916 has 6 divisors (see below), whose sum is σ = 2960854610. Its totient is φ = 845958456.

The previous prime is 1691916907. The next prime is 1691916943. The reversal of 1691916916 is 6196191961.

It can be written as a sum of positive squares in only one way, i.e., 1353504100 + 338412816 = 36790^2 + 18396^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1691916916.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 211489611 + ... + 211489618.

Almost surely, 2^1691916916 is an apocalyptic number.

It is an amenable number.

1691916916 is a deficient number, since it is larger than the sum of its proper divisors (1268937694).

1691916916 is a wasteful number, since it uses less digits than its factorization.

1691916916 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 422979233 (or 422979231 counting only the distinct ones).

The product of its digits is 157464, while the sum is 49.

The square root of 1691916916 is about 41132.9176694287. The cubic root of 1691916916 is about 1191.5886124847.

The spelling of 1691916916 in words is "one billion, six hundred ninety-one million, nine hundred sixteen thousand, nine hundred sixteen".