2160381 has 4 divisors (see below), whose sum is σ = 2880512. Its totient is φ = 1440252.

The previous prime is 2160373. The next prime is 2160383. The reversal of 2160381 is 1830612.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 2160381 - 2³ = 2160373 is a prime.

It is a super-2 number, since 2×2160381² = 9334492130322, which contains 22 as substring.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2160383) 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, 360061 + ... + 360066.

It is an arithmetic number, because the mean of its divisors is an integer number (720128).

2^2160381 is an apocalyptic number.

It is an amenable number.

2160381 is a deficient number, since it is larger than the sum of its proper divisors (720131).

2160381 is an equidigital number, since it uses as much as digits as its factorization.

2160381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 720130.

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 2160381 is about 1469.8234587868. The cubic root of 2160381 is about 129.2736813219.

Adding to 2160381 its reverse (1830612), we get a palindrome (3990993).

The spelling of 2160381 in words is "two million, one hundred sixty thousand, three hundred eighty-one".