2051851187 has 4 divisors (see below), whose sum is σ = 2052210336. Its totient is φ = 2051492040.

The previous prime is 2051851177. The next prime is 2051851189. The reversal of 2051851187 is 7811581502.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7811581502 = 2 ⋅3905790751.

It is a cyclic number.

It is not a de Polignac number, because 2051851187 - 2¹⁴ = 2051834803 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2051851187.

It is not an unprimeable number, because it can be changed into a prime (2051851189) 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, 170864 + ... + 182477.

It is an arithmetic number, because the mean of its divisors is an integer number (513052584).

Almost surely, 2^2051851187 is an apocalyptic number.

2051851187 is a deficient number, since it is larger than the sum of its proper divisors (359149).

2051851187 is an equidigital number, since it uses as much as digits as its factorization.

2051851187 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 359148.

The product of its (nonzero) digits is 22400, while the sum is 38.

The square root of 2051851187 is about 45297.3640182296. The cubic root of 2051851187 is about 1270.7163559366.

The spelling of 2051851187 in words is "two billion, fifty-one million, eight hundred fifty-one thousand, one hundred eighty-seven".