2811955 has 12 divisors (see below), whose sum is σ = 3460752. Its totient is φ = 2192960.

The previous prime is 2811947. The next prime is 2811959. The reversal of 2811955 is 5591182.

2811955 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 2811955 - 2³ = 2811947 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2811959) 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 11 ways as a sum of consecutive naturals, for example, 31551 + ... + 31639.

It is an arithmetic number, because the mean of its divisors is an integer number (288396).

2^2811955 is an apocalyptic number.

2811955 is a deficient number, since it is larger than the sum of its proper divisors (648797).

2811955 is an frugal number, since it uses more digits than its factorization.

2811955 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 254 (or 165 counting only the distinct ones).

The product of its digits is 3600, while the sum is 31.

The square root of 2811955 is about 1676.8884876461. Note that the first 3 decimals coincide. The cubic root of 2811955 is about 141.1462861496.

The spelling of 2811955 in words is "two million, eight hundred eleven thousand, nine hundred fifty-five".