2160491 has 4 divisors (see below), whose sum is σ = 2181984. Its totient is φ = 2139000.

The previous prime is 2160469. The next prime is 2160527. The reversal of 2160491 is 1940612.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2160491 is a prime.

It is a super-2 number, since 2×2160491² = 9335442722162, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2160461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10595 + ... + 10796.

It is an arithmetic number, because the mean of its divisors is an integer number (545496).

2^2160491 is an apocalyptic number.

2160491 is a deficient number, since it is larger than the sum of its proper divisors (21493).

2160491 is a wasteful number, since it uses less digits than its factorization.

2160491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21492.

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 2160491 is about 1469.8608777704. The cubic root of 2160491 is about 129.2758753583.

The spelling of 2160491 in words is "two million, one hundred sixty thousand, four hundred ninety-one".