2131906128 has 80 divisors (see below), whose sum is σ = 6080610816. Its totient is φ = 638235520.

The previous prime is 2131906123. The next prime is 2131906129. The reversal of 2131906128 is 8216091312.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2131906123) 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, 19501 + ... + 68147.

Almost surely, 2^2131906128 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2131906128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3040305408).

2131906128 is an abundant number, since it is smaller than the sum of its proper divisors (3948704688).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2131906128 is a wasteful number, since it uses less digits than its factorization.

2131906128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48752 (or 48746 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 33.

The square root of 2131906128 is about 46172.5689993529. The cubic root of 2131906128 is about 1287.0320421830.

The spelling of 2131906128 in words is "two billion, one hundred thirty-one million, nine hundred six thousand, one hundred twenty-eight".