2181154 has 4 divisors (see below), whose sum is σ = 3271734. Its totient is φ = 1090576.

The previous prime is 2181149. The next prime is 2181161. The reversal of 2181154 is 4511812.

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

It can be written as a sum of positive squares in only one way, i.e., 2002225 + 178929 = 1415^2 + 423^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 545287 + ... + 545290.

2^2181154 is an apocalyptic number.

2181154 is a deficient number, since it is larger than the sum of its proper divisors (1090580).

2181154 is a wasteful number, since it uses less digits than its factorization.

2181154 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1090579.

The product of its digits is 320, while the sum is 22.

The square root of 2181154 is about 1476.8730480309. The cubic root of 2181154 is about 129.6867011805.

Adding to 2181154 its reverse (4511812), we get a palindrome (6692966).

The spelling of 2181154 in words is "two million, one hundred eighty-one thousand, one hundred fifty-four".