1979887113 has 12 divisors (see below), whose sum is σ = 2864852848. Its totient is φ = 1317609720.

The previous prime is 1979887111. The next prime is 1979887123. The reversal of 1979887113 is 3117889791.

It is not a de Polignac number, because 1979887113 - 2¹ = 1979887111 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1979887113.

It is not an unprimeable number, because it can be changed into a prime (1979887111) 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 11 ways as a sum of consecutive naturals, for example, 187495 + ... + 197772.

Almost surely, 2^1979887113 is an apocalyptic number.

It is an amenable number.

1979887113 is a deficient number, since it is larger than the sum of its proper divisors (884965735).

1979887113 is a wasteful number, since it uses less digits than its factorization.

1979887113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 385844 (or 385841 counting only the distinct ones).

The product of its digits is 762048, while the sum is 54.

The square root of 1979887113 is about 44495.9224311622. The cubic root of 1979887113 is about 1255.6833710451.

The spelling of 1979887113 in words is "one billion, nine hundred seventy-nine million, eight hundred eighty-seven thousand, one hundred thirteen".