2111525125 has 8 divisors (see below), whose sum is σ = 2635183512. Its totient is φ = 1689220000.

The previous prime is 2111525123. The next prime is 2111525179. The reversal of 2111525125 is 5215251112.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 42276004 + 2069249121 = 6502^2 + 45489^2 .

It is not a de Polignac number, because 2111525125 - 2¹ = 2111525123 is a prime.

It is a super-3 number, since 3×2111525125³ (a number of 29 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2111525125.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2111525123) 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, 8445976 + ... + 8446225.

It is an arithmetic number, because the mean of its divisors is an integer number (329397939).

Almost surely, 2^2111525125 is an apocalyptic number.

2111525125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

2111525125 is a deficient number, since it is larger than the sum of its proper divisors (523658387).

2111525125 is an equidigital number, since it uses as much as digits as its factorization.

2111525125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16892216 (or 16892206 counting only the distinct ones).

The product of its digits is 1000, while the sum is 25.

The square root of 2111525125 is about 45951.3343114213. The cubic root of 2111525125 is about 1282.9175645716.

Adding to 2111525125 its reverse (5215251112), we get a palindrome (7326776237).

The spelling of 2111525125 in words is "two billion, one hundred eleven million, five hundred twenty-five thousand, one hundred twenty-five".