2181249 has 20 divisors (see below), whose sum is σ = 3724864. Its totient is φ = 1246104.

The previous prime is 2181247. The next prime is 2181259. The reversal of 2181249 is 9421812.

2181249 is nontrivially palindromic in base 8.

It is not a de Polignac number, because 2181249 - 2¹ = 2181247 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2181247) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1357 + ... + 2490.

2^2181249 is an apocalyptic number.

It is an amenable number.

2181249 is a deficient number, since it is larger than the sum of its proper divisors (1543615).

2181249 is an equidigital number, since it uses as much as digits as its factorization.

2181249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3866 (or 3857 counting only the distinct ones).

The product of its digits is 1152, while the sum is 27.

The square root of 2181249 is about 1476.9052102285. The cubic root of 2181249 is about 129.6885839847.

The spelling of 2181249 in words is "two million, one hundred eighty-one thousand, two hundred forty-nine".