1981123196 has 12 divisors (see below), whose sum is σ = 3733655352. Its totient is φ = 914364528.

The previous prime is 1981123189. The next prime is 1981123213. The reversal of 1981123196 is 6913211891.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19049210 + ... + 19049313.

It is an arithmetic number, because the mean of its divisors is an integer number (311137946).

Almost surely, 2^1981123196 is an apocalyptic number.

It is an amenable number.

1981123196 is a deficient number, since it is larger than the sum of its proper divisors (1752532156).

1981123196 is a wasteful number, since it uses less digits than its factorization.

1981123196 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38098540 (or 38098538 counting only the distinct ones).

The product of its digits is 23328, while the sum is 41.

The square root of 1981123196 is about 44509.8101096826. The cubic root of 1981123196 is about 1255.9446327372.

The spelling of 1981123196 in words is "one billion, nine hundred eighty-one million, one hundred twenty-three thousand, one hundred ninety-six".