2185502172 has 48 divisors (see below), whose sum is σ = 5865162240. Its totient is φ = 620448192.

The previous prime is 2185502161. The next prime is 2185502173. The reversal of 2185502172 is 2712055812.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2185502173) 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 15 ways as a sum of consecutive naturals, for example, 69672 + ... + 96047.

It is an arithmetic number, because the mean of its divisors is an integer number (122190880).

Almost surely, 2^2185502172 is an apocalyptic number.

It is an amenable number.

2185502172 is an abundant number, since it is smaller than the sum of its proper divisors (3679660068).

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

2185502172 is a wasteful number, since it uses less digits than its factorization.

2185502172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165890 (or 165888 counting only the distinct ones).

The product of its (nonzero) digits is 11200, while the sum is 33.

The square root of 2185502172 is about 46749.3547762961. The cubic root of 2185502172 is about 1297.7282161375.

Adding to 2185502172 its reverse (2712055812), we get a palindrome (4897557984).

The spelling of 2185502172 in words is "two billion, one hundred eighty-five million, five hundred two thousand, one hundred seventy-two".