1691683349 has 4 divisors (see below), whose sum is σ = 1694274636. Its totient is φ = 1689092064.

The previous prime is 1691683313. The next prime is 1691683363. The reversal of 1691683349 is 9433861961.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9433861961 = 89 ⋅105998449.

It can be written as a sum of positive squares in 2 ways, for example, as 1020355249 + 671328100 = 31943^2 + 25910^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1691683349 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1691683297 and 1691683306.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1691683369) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1294664 + ... + 1295969.

It is an arithmetic number, because the mean of its divisors is an integer number (423568659).

Almost surely, 2^1691683349 is an apocalyptic number.

It is an amenable number.

1691683349 is a deficient number, since it is larger than the sum of its proper divisors (2591287).

1691683349 is an equidigital number, since it uses as much as digits as its factorization.

1691683349 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2591286.

The product of its digits is 839808, while the sum is 50.

The square root of 1691683349 is about 41130.0783976885. The cubic root of 1691683349 is about 1191.5337775255.

The spelling of 1691683349 in words is "one billion, six hundred ninety-one million, six hundred eighty-three thousand, three hundred forty-nine".