2811321 has 8 divisors (see below), whose sum is σ = 4164960. Its totient is φ = 1874196.

The previous prime is 2811317. The next prime is 2811331. The reversal of 2811321 is 1231182.

It is not a de Polignac number, because 2811321 - 2² = 2811317 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2811294 and 2811303.

It is not an unprimeable number, because it can be changed into a prime (2811311) 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 7 ways as a sum of consecutive naturals, for example, 52035 + ... + 52088.

It is an arithmetic number, because the mean of its divisors is an integer number (520620).

2^2811321 is an apocalyptic number.

It is an amenable number.

2811321 is a deficient number, since it is larger than the sum of its proper divisors (1353639).

2811321 is a wasteful number, since it uses less digits than its factorization.

2811321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104132 (or 104126 counting only the distinct ones).

The product of its digits is 96, while the sum is 18.

The square root of 2811321 is about 1676.6994363928. The cubic root of 2811321 is about 141.1356774602.

The spelling of 2811321 in words is "two million, eight hundred eleven thousand, three hundred twenty-one".