2811121 has 4 divisors (see below), whose sum is σ = 2815972. Its totient is φ = 2806272.

The previous prime is 2811113. The next prime is 2811131. The reversal of 2811121 is 1211182.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1860496 + 950625 = 1364^2 + 975^2 .

It is a cyclic number.

It is not a de Polignac number, because 2811121 - 2³ = 2811113 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2811095 and 2811104.

It is not an unprimeable number, because it can be changed into a prime (2811131) 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, 1416 + ... + 2761.

It is an arithmetic number, because the mean of its divisors is an integer number (703993).

2^2811121 is an apocalyptic number.

It is an amenable number.

2811121 is a deficient number, since it is larger than the sum of its proper divisors (4851).

2811121 is an equidigital number, since it uses as much as digits as its factorization.

2811121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4850.

The product of its digits is 32, while the sum is 16.

The square root of 2811121 is about 1676.6397943506. The cubic root of 2811121 is about 141.1323305396.

The spelling of 2811121 in words is "two million, eight hundred eleven thousand, one hundred twenty-one".