2131981893 has 24 divisors (see below), whose sum is σ = 3210854400. Its totient is φ = 1361483424.

The previous prime is 2131981843. The next prime is 2131981931. The reversal of 2131981893 is 3981891312.

It is not a de Polignac number, because 2131981893 - 2⁶ = 2131981829 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2131981843) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 988 + ... + 65306.

It is an arithmetic number, because the mean of its divisors is an integer number (133785600).

Almost surely, 2^2131981893 is an apocalyptic number.

It is an amenable number.

2131981893 is a deficient number, since it is larger than the sum of its proper divisors (1078872507).

2131981893 is a wasteful number, since it uses less digits than its factorization.

2131981893 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64481 (or 64478 counting only the distinct ones).

The product of its digits is 93312, while the sum is 45.

The square root of 2131981893 is about 46173.3894467365. The cubic root of 2131981893 is about 1287.0472884496.

The spelling of 2131981893 in words is "two billion, one hundred thirty-one million, nine hundred eighty-one thousand, eight hundred ninety-three".