2165489125 has 8 divisors (see below), whose sum is σ = 2702530584. Its totient is φ = 1732391200.

The previous prime is 2165489119. The next prime is 2165489129. The reversal of 2165489125 is 5219845612.

It can be written as a sum of positive squares in 4 ways, for example, as 36312676 + 2129176449 = 6026^2 + 46143^2 .

It is not a de Polignac number, because 2165489125 - 2⁹ = 2165488613 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 (2165489129) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8661832 + ... + 8662081.

It is an arithmetic number, because the mean of its divisors is an integer number (337816323).

Almost surely, 2^2165489125 is an apocalyptic number.

2165489125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

2165489125 is a deficient number, since it is larger than the sum of its proper divisors (537041459).

2165489125 is an equidigital number, since it uses as much as digits as its factorization.

2165489125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17323928 (or 17323918 counting only the distinct ones).

The product of its digits is 172800, while the sum is 43.

The square root of 2165489125 is about 46534.8162669630. The cubic root of 2165489125 is about 1293.7548841873.

The spelling of 2165489125 in words is "two billion, one hundred sixty-five million, four hundred eighty-nine thousand, one hundred twenty-five".