2181361 has 8 divisors (see below), whose sum is σ = 2684864. Its totient is φ = 1725840.

The previous prime is 2181359. The next prime is 2181373. The reversal of 2181361 is 1631812.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2181361 - 2¹ = 2181359 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2181331) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11895 + ... + 12076.

It is an arithmetic number, because the mean of its divisors is an integer number (335608).

2^2181361 is an apocalyptic number.

It is an amenable number.

2181361 is a deficient number, since it is larger than the sum of its proper divisors (503503).

2181361 is a wasteful number, since it uses less digits than its factorization.

2181361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23991.

The product of its digits is 288, while the sum is 22.

The square root of 2181361 is about 1476.9431268671. The cubic root of 2181361 is about 129.6908036416.

The spelling of 2181361 in words is "two million, one hundred eighty-one thousand, three hundred sixty-one".