2731121 has 4 divisors (see below), whose sum is σ = 2771952. Its totient is φ = 2690292.

The previous prime is 2731111. The next prime is 2731129. The reversal of 2731121 is 1211372.

2731121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 a cyclic number.

It is not a de Polignac number, because 2731121 - 2¹⁴ = 2714737 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2731121.

It is not an unprimeable number, because it can be changed into a prime (2731129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20315 + ... + 20448.

It is an arithmetic number, because the mean of its divisors is an integer number (692988).

2^2731121 is an apocalyptic number.

It is an amenable number.

2731121 is a deficient number, since it is larger than the sum of its proper divisors (40831).

2731121 is an equidigital number, since it uses as much as digits as its factorization.

2731121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40830.

The product of its digits is 84, while the sum is 17.

The square root of 2731121 is about 1652.6103594012. The cubic root of 2731121 is about 139.7806258171.

Adding to 2731121 its reverse (1211372), we get a palindrome (3942493).

The spelling of 2731121 in words is "two million, seven hundred thirty-one thousand, one hundred twenty-one".