2131864636 has 18 divisors (see below), whose sum is σ = 4100757080. Its totient is φ = 969029160.

The previous prime is 2131864627. The next prime is 2131864649. The reversal of 2131864636 is 6364681312.

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 in 5 ways as a sum of consecutive naturals, for example, 2201856 + ... + 2202823.

Almost surely, 2^2131864636 is an apocalyptic number.

It is an amenable number.

2131864636 is a deficient number, since it is larger than the sum of its proper divisors (1968892444).

2131864636 is a wasteful number, since it uses less digits than its factorization.

2131864636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4404705 (or 4404692 counting only the distinct ones).

The product of its digits is 124416, while the sum is 40.

The square root of 2131864636 is about 46172.1196827696. The cubic root of 2131864636 is about 1287.0236925533.

The spelling of 2131864636 in words is "two billion, one hundred thirty-one million, eight hundred sixty-four thousand, six hundred thirty-six".