2181254 has 4 divisors (see below), whose sum is σ = 3271884. Its totient is φ = 1090626.

The previous prime is 2181247. The next prime is 2181259. The reversal of 2181254 is 4521812.

It is a semiprime because it is the product of two primes.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2181259) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 545312 + ... + 545315.

It is an arithmetic number, because the mean of its divisors is an integer number (817971).

2^2181254 is an apocalyptic number.

2181254 is a deficient number, since it is larger than the sum of its proper divisors (1090630).

2181254 is a wasteful number, since it uses less digits than its factorization.

2181254 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1090629.

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

The square root of 2181254 is about 1476.9069029563. The cubic root of 2181254 is about 129.6886830782.

It can be divided in two parts, 218 and 1254, that multiplied together give a palindrome (273372).

The spelling of 2181254 in words is "two million, one hundred eighty-one thousand, two hundred fifty-four".