1211111982 has 12 divisors (see below), whose sum is σ = 2624076000. Its totient is φ = 403703988.

The previous prime is 1211111981. The next prime is 1211112017. The reversal of 1211111982 is 2891111121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211111981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 33641982 + ... + 33642017.

It is an arithmetic number, because the mean of its divisors is an integer number (218673000).

Almost surely, 2^1211111982 is an apocalyptic number.

1211111982 is an abundant number, since it is smaller than the sum of its proper divisors (1412964018).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1211111982 is a wasteful number, since it uses less digits than its factorization.

1211111982 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67284007 (or 67284004 counting only the distinct ones).

The product of its digits is 288, while the sum is 27.

The square root of 1211111982 is about 34801.0342087703. The cubic root of 1211111982 is about 1065.9285639596.

The spelling of 1211111982 in words is "one billion, two hundred eleven million, one hundred eleven thousand, nine hundred eighty-two".