2187151871 has 4 divisors (see below), whose sum is σ = 2238015912. Its totient is φ = 2136287832.

The previous prime is 2187151861. The next prime is 2187151873. The reversal of 2187151871 is 1781517812.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2187151871 - 2³⁰ = 1113410047 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2187151873) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25431956 + ... + 25432041.

It is an arithmetic number, because the mean of its divisors is an integer number (559503978).

Almost surely, 2^2187151871 is an apocalyptic number.

2187151871 is a deficient number, since it is larger than the sum of its proper divisors (50864041).

2187151871 is an equidigital number, since it uses as much as digits as its factorization.

2187151871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50864040.

The product of its digits is 31360, while the sum is 41.

The square root of 2187151871 is about 46766.9955310366. The cubic root of 2187151871 is about 1298.0546586559.

The spelling of 2187151871 in words is "two billion, one hundred eighty-seven million, one hundred fifty-one thousand, eight hundred seventy-one".