2101981862 has 4 divisors (see below), whose sum is σ = 3152972796. Its totient is φ = 1050990930.

The previous prime is 2101981829. The next prime is 2101981867. The reversal of 2101981862 is 2681891012.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2101981867) by changing a digit.

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, 525495464 + ... + 525495467.

It is an arithmetic number, because the mean of its divisors is an integer number (788243199).

Almost surely, 2^2101981862 is an apocalyptic number.

2101981862 is a deficient number, since it is larger than the sum of its proper divisors (1050990934).

2101981862 is a wasteful number, since it uses less digits than its factorization.

2101981862 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1050990933.

The product of its (nonzero) digits is 13824, while the sum is 38.

The square root of 2101981862 is about 45847.3757373309. The cubic root of 2101981862 is about 1280.9818845459.

The spelling of 2101981862 in words is "two billion, one hundred one million, nine hundred eighty-one thousand, eight hundred sixty-two".