945621121 has 2 divisors, whose sum is σ = 945621122. Its totient is φ = 945621120.

The previous prime is 945621113. The next prime is 945621139. The reversal of 945621121 is 121126549.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 720170896 + 225450225 = 26836^2 + 15015^2 .

It is an emirp because it is prime and its reverse (121126549) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 945621121 - 2³ = 945621113 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (945621421) 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 as a sum of consecutive naturals, namely, 472810560 + 472810561.

It is an arithmetic number, because the mean of its divisors is an integer number (472810561).

Almost surely, 2^945621121 is an apocalyptic number.

It is an amenable number.

945621121 is a deficient number, since it is larger than the sum of its proper divisors (1).

945621121 is an equidigital number, since it uses as much as digits as its factorization.

945621121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4320, while the sum is 31.

The square root of 945621121 is about 30750.9531722189. The cubic root of 945621121 is about 981.5348436395.

The spelling of 945621121 in words is "nine hundred forty-five million, six hundred twenty-one thousand, one hundred twenty-one".