2281181921 has 2 divisors, whose sum is σ = 2281181922. Its totient is φ = 2281181920.

The previous prime is 2281181893. The next prime is 2281181927. The reversal of 2281181921 is 1291811822.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1522950625 + 758231296 = 39025^2 + 27536^2 .

It is a cyclic number.

It is not a de Polignac number, because 2281181921 - 2²² = 2276987617 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (2281181927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1140590960 + 1140590961.

It is an arithmetic number, because the mean of its divisors is an integer number (1140590961).

Almost surely, 2^2281181921 is an apocalyptic number.

It is an amenable number.

2281181921 is a deficient number, since it is larger than the sum of its proper divisors (1).

2281181921 is an equidigital number, since it uses as much as digits as its factorization.

2281181921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4608, while the sum is 35.

The square root of 2281181921 is about 47761.7202474953. The cubic root of 2281181921 is about 1316.3962617772.

The spelling of 2281181921 in words is "two billion, two hundred eighty-one million, one hundred eighty-one thousand, nine hundred twenty-one".