1981196216 has 8 divisors (see below), whose sum is σ = 3714742920. Its totient is φ = 990598104.

The previous prime is 1981196209. The next prime is 1981196221. The reversal of 1981196216 is 6126911891.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 123824756 + ... + 123824771.

It is an arithmetic number, because the mean of its divisors is an integer number (464342865).

Almost surely, 2^1981196216 is an apocalyptic number.

It is an amenable number.

1981196216 is a deficient number, since it is larger than the sum of its proper divisors (1733546704).

1981196216 is a wasteful number, since it uses less digits than its factorization.

1981196216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 247649533 (or 247649529 counting only the distinct ones).

The product of its digits is 46656, while the sum is 44.

The square root of 1981196216 is about 44510.6303707328. The cubic root of 1981196216 is about 1255.9600630330.

The spelling of 1981196216 in words is "one billion, nine hundred eighty-one million, one hundred ninety-six thousand, two hundred sixteen".