2187948181 has 8 divisors (see below), whose sum is σ = 2297178720. Its totient is φ = 2080969968.

The previous prime is 2187948179. The next prime is 2187948227. The reversal of 2187948181 is 1818497812.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2187948181 - 2¹ = 2187948179 is a prime.

It is a super-2 number, since 2×2187948181² = 9574234485482417522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2187948881) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 561091 + ... + 564976.

It is an arithmetic number, because the mean of its divisors is an integer number (287147340).

Almost surely, 2^2187948181 is an apocalyptic number.

It is an amenable number.

2187948181 is a deficient number, since it is larger than the sum of its proper divisors (109230539).

2187948181 is a wasteful number, since it uses less digits than its factorization.

2187948181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1126163.

The product of its digits is 258048, while the sum is 49.

The square root of 2187948181 is about 46775.5083457144. The cubic root of 2187948181 is about 1298.2121737784.

The spelling of 2187948181 in words is "two billion, one hundred eighty-seven million, nine hundred forty-eight thousand, one hundred eighty-one".