2181425 has 6 divisors (see below), whose sum is σ = 2704998. Its totient is φ = 1745120.

The previous prime is 2181419. The next prime is 2181449. The reversal of 2181425 is 5241812.

It can be written as a sum of positive squares in 3 ways, for example, as 14641 + 2166784 = 121^2 + 1472^2 .

It is not a de Polignac number, because 2181425 - 2⁸ = 2181169 is a prime.

It is a d-powerful number, because it can be written as 2 + 1 + 8⁷ + 1 + 4⁶ + 2¹¹ + 5⁷ .

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 2181425.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 43604 + ... + 43653.

It is an arithmetic number, because the mean of its divisors is an integer number (450833).

2^2181425 is an apocalyptic number.

2181425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

2181425 is a deficient number, since it is larger than the sum of its proper divisors (523573).

2181425 is an equidigital number, since it uses as much as digits as its factorization.

2181425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87267 (or 87262 counting only the distinct ones).

The product of its digits is 640, while the sum is 23.

The square root of 2181425 is about 1476.9647930807. The cubic root of 2181425 is about 129.6920719828.

The spelling of 2181425 in words is "two million, one hundred eighty-one thousand, four hundred twenty-five".