2131897916 has 12 divisors (see below), whose sum is σ = 3731370888. Its totient is φ = 1065791952.

The previous prime is 2131897897. The next prime is 2131897919. The reversal of 2131897916 is 6197981312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2131897919) 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 in 3 ways as a sum of consecutive naturals, for example, 5471 + ... + 65526.

It is an arithmetic number, because the mean of its divisors is an integer number (310947574).

Almost surely, 2^2131897916 is an apocalyptic number.

It is an amenable number.

2131897916 is a deficient number, since it is larger than the sum of its proper divisors (1599472972).

2131897916 is a wasteful number, since it uses less digits than its factorization.

2131897916 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78508 (or 78506 counting only the distinct ones).

The product of its digits is 163296, while the sum is 47.

The square root of 2131897916 is about 46172.4800720083. The cubic root of 2131897916 is about 1287.0303896523.

The spelling of 2131897916 in words is "two billion, one hundred thirty-one million, eight hundred ninety-seven thousand, nine hundred sixteen".