2181529 has 9 divisors (see below), whose sum is σ = 2549781. Its totient is φ = 1861020.

The previous prime is 2181503. The next prime is 2181539. The reversal of 2181529 is 9251812.

The square root of 2181529 is 1477.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 2181529 - 2⁹ = 2181017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2181497 and 2181506.

It is not an unprimeable number, because it can be changed into a prime (2181539) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 10234 + ... + 10444.

It is an arithmetic number, because the mean of its divisors is an integer number (283309).

2^2181529 is an apocalyptic number.

2181529 is the 1477-th square number.

2181529 is the 739-th centered octagonal number.

It is an amenable number.

2181529 is a deficient number, since it is larger than the sum of its proper divisors (368252).

2181529 is an frugal number, since it uses more digits than its factorization.

2181529 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 436 (or 218 counting only the distinct ones).

The product of its digits is 1440, while the sum is 28.

The cubic root of 2181529 is about 129.6941329844.

The spelling of 2181529 in words is "two million, one hundred eighty-one thousand, five hundred twenty-nine".