2155164187 has 4 divisors (see below), whose sum is σ = 2351088216. Its totient is φ = 1959240160.

The previous prime is 2155164173. The next prime is 2155164199. The reversal of 2155164187 is 7814615512.

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 2155164187 - 2⁷ = 2155164059 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2155164107) 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 3 ways as a sum of consecutive naturals, for example, 97961998 + ... + 97962019.

It is an arithmetic number, because the mean of its divisors is an integer number (587772054).

Almost surely, 2^2155164187 is an apocalyptic number.

2155164187 is a deficient number, since it is larger than the sum of its proper divisors (195924029).

2155164187 is a wasteful number, since it uses less digits than its factorization.

2155164187 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 195924028.

The product of its digits is 67200, while the sum is 40.

The square root of 2155164187 is about 46423.7459389050. The cubic root of 2155164187 is about 1291.6954225458.

Adding to 2155164187 its reverse (7814615512), we get a palindrome (9969779699).

The spelling of 2155164187 in words is "two billion, one hundred fifty-five million, one hundred sixty-four thousand, one hundred eighty-seven".