2125685125 has 8 divisors (see below), whose sum is σ = 2652855192. Its totient is φ = 1700548000.

The previous prime is 2125685071. The next prime is 2125685129. The reversal of 2125685125 is 5215865212.

It can be written as a sum of positive squares in 4 ways, for example, as 81108036 + 2044577089 = 9006^2 + 45217^2 .

It is a de Polignac number, because none of the positive numbers 2^k-2125685125 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 (2125685129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8502616 + ... + 8502865.

It is an arithmetic number, because the mean of its divisors is an integer number (331606899).

Almost surely, 2^2125685125 is an apocalyptic number.

2125685125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

2125685125 is a deficient number, since it is larger than the sum of its proper divisors (527170067).

2125685125 is an equidigital number, since it uses as much as digits as its factorization.

2125685125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17005496 (or 17005486 counting only the distinct ones).

The product of its digits is 48000, while the sum is 37.

The square root of 2125685125 is about 46105.1529115781. The cubic root of 2125685125 is about 1285.7789490553.

The spelling of 2125685125 in words is "two billion, one hundred twenty-five million, six hundred eighty-five thousand, one hundred twenty-five".