1671987813 has 8 divisors (see below), whose sum is σ = 2233078848. Its totient is φ = 1112777664.

The previous prime is 1671987809. The next prime is 1671987841. The reversal of 1671987813 is 3187891761.

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

It is not a de Polignac number, because 1671987813 - 2² = 1671987809 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1671987803) 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 7 ways as a sum of consecutive naturals, for example, 468145 + ... + 471702.

It is an arithmetic number, because the mean of its divisors is an integer number (279134856).

Almost surely, 2^1671987813 is an apocalyptic number.

It is an amenable number.

1671987813 is a deficient number, since it is larger than the sum of its proper divisors (561091035).

1671987813 is an equidigital number, since it uses as much as digits as its factorization.

1671987813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 940443.

The product of its digits is 508032, while the sum is 51.

The square root of 1671987813 is about 40889.9475788365. The cubic root of 1671987813 is about 1186.8915443644.

The spelling of 1671987813 in words is "one billion, six hundred seventy-one million, nine hundred eighty-seven thousand, eight hundred thirteen".