1891688349 has 8 divisors (see below), whose sum is σ = 2569840992. Its totient is φ = 1237330640.

The previous prime is 1891688333. The next prime is 1891688369. The reversal of 1891688349 is 9438861981.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1891688349 - 2⁴ = 1891688333 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1891688329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5948547 + ... + 5948864.

It is an arithmetic number, because the mean of its divisors is an integer number (321230124).

Almost surely, 2^1891688349 is an apocalyptic number.

It is an amenable number.

1891688349 is a deficient number, since it is larger than the sum of its proper divisors (678152643).

1891688349 is a wasteful number, since it uses less digits than its factorization.

1891688349 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11897467.

The product of its digits is 2985984, while the sum is 57.

The square root of 1891688349 is about 43493.5437622643. The cubic root of 1891688349 is about 1236.7536374038.

The spelling of 1891688349 in words is "one billion, eight hundred ninety-one million, six hundred eighty-eight thousand, three hundred forty-nine".