2131979866 has 8 divisors (see below), whose sum is σ = 3199552020. Its totient is φ = 1065462528.

The previous prime is 2131979851. The next prime is 2131979879. The reversal of 2131979866 is 6689791312.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 2131207225 + 772641 = 46165^2 + 879^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 258631 + ... + 266746.

Almost surely, 2^2131979866 is an apocalyptic number.

2131979866 is a deficient number, since it is larger than the sum of its proper divisors (1067572154).

2131979866 is a wasteful number, since it uses less digits than its factorization.

2131979866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 527408.

The product of its digits is 979776, while the sum is 52.

The square root of 2131979866 is about 46173.3674968591. The cubic root of 2131979866 is about 1287.0468805591.

The spelling of 2131979866 in words is "two billion, one hundred thirty-one million, nine hundred seventy-nine thousand, eight hundred sixty-six".