2031891012 has 18 divisors (see below), whose sum is σ = 5136169038. Its totient is φ = 677296992.

The previous prime is 2031890999. The next prime is 2031891031. The reversal of 2031891012 is 2101981302.

It can be written as a sum of positive squares in only one way, i.e., 1427026176 + 604864836 = 37776^2 + 24594^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 28220673 + ... + 28220744.

Almost surely, 2^2031891012 is an apocalyptic number.

It is an amenable number.

2031891012 is an abundant number, since it is smaller than the sum of its proper divisors (3104278026).

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

2031891012 is a wasteful number, since it uses less digits than its factorization.

2031891012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56441427 (or 56441422 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 27.

The square root of 2031891012 is about 45076.5017719876. The cubic root of 2031891012 is about 1266.5824607304.

The spelling of 2031891012 in words is "two billion, thirty-one million, eight hundred ninety-one thousand, twelve".