2181025 has 36 divisors (see below), whose sum is σ = 3430336. Its totient is φ = 1346400.

The previous prime is 2181017. The next prime is 2181031. The reversal of 2181025 is 5201812.

It is not a de Polignac number, because 2181025 - 2³ = 2181017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2180993 and 2181011.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 21124 + ... + 21226.

2^2181025 is an apocalyptic number.

2181025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

2181025 is a deficient number, since it is larger than the sum of its proper divisors (1249311).

2181025 is a wasteful number, since it uses less digits than its factorization.

2181025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142 (or 126 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 19.

The square root of 2181025 is about 1476.8293740307. The cubic root of 2181025 is about 129.6841444431.

Adding to 2181025 its reverse (5201812), we get a palindrome (7382837).

The spelling of 2181025 in words is "two million, one hundred eighty-one thousand, twenty-five".