2181413 has 4 divisors (see below), whose sum is σ = 2349228. Its totient is φ = 2013600.

The previous prime is 2181379. The next prime is 2181419. The reversal of 2181413 is 3141812.

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

It can be written as a sum of positive squares in 2 ways, for example, as 113569 + 2067844 = 337^2 + 1438^2 .

It is a cyclic number.

It is not a de Polignac number, because 2181413 - 2⁶ = 2181349 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2181419) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 83888 + ... + 83913.

It is an arithmetic number, because the mean of its divisors is an integer number (587307).

2^2181413 is an apocalyptic number.

It is an amenable number.

2181413 is a deficient number, since it is larger than the sum of its proper divisors (167815).

2181413 is a wasteful number, since it uses less digits than its factorization.

2181413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167814.

The product of its digits is 192, while the sum is 20.

The square root of 2181413 is about 1476.9607306899. The cubic root of 2181413 is about 129.6918341707.

The spelling of 2181413 in words is "two million, one hundred eighty-one thousand, four hundred thirteen".