2311921 has 2 divisors, whose sum is σ = 2311922. Its totient is φ = 2311920.

The previous prime is 2311889. The next prime is 2311931. The reversal of 2311921 is 1291132.

2311921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2310400 + 1521 = 1520^2 + 39^2 .

It is a cyclic number.

It is not a de Polignac number, because 2311921 - 2⁵ = 2311889 is a prime.

It is a Chen prime.

It is the 1521-st Hogben number.

2311921 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (2311931) by changing a digit.

It is a nontrivial repunit in base 1520.

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 as a sum of consecutive naturals, namely, 1155960 + 1155961.

It is an arithmetic number, because the mean of its divisors is an integer number (1155961).

2^2311921 is an apocalyptic number.

It is an amenable number.

2311921 is a deficient number, since it is larger than the sum of its proper divisors (1).

2311921 is an equidigital number, since it uses as much as digits as its factorization.

2311921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 108, while the sum is 19.

The square root of 2311921 is about 1520.5002466294. The cubic root of 2311921 is about 132.2282742746.

The spelling of 2311921 in words is "two million, three hundred eleven thousand, nine hundred twenty-one".