2131611812 has 48 divisors (see below), whose sum is σ = 4221745920. Its totient is φ = 933254400.

The previous prime is 2131611809. The next prime is 2131611817. The reversal of 2131611812 is 2181161312.

It is not an unprimeable number, because it can be changed into a prime (2131611817) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 135038 + ... + 149994.

It is an arithmetic number, because the mean of its divisors is an integer number (87953040).

Almost surely, 2^2131611812 is an apocalyptic number.

2131611812 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

2131611812 is a deficient number, since it is larger than the sum of its proper divisors (2090134108).

2131611812 is a wasteful number, since it uses less digits than its factorization.

2131611812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15092 (or 15090 counting only the distinct ones).

The product of its digits is 576, while the sum is 26.

The square root of 2131611812 is about 46169.3817589103. The cubic root of 2131611812 is about 1286.9728132532.

The spelling of 2131611812 in words is "two billion, one hundred thirty-one million, six hundred eleven thousand, eight hundred twelve".