4451921 has 2 divisors, whose sum is σ = 4451922. Its totient is φ = 4451920.

The previous prime is 4451893. The next prime is 4451929. The reversal of 4451921 is 1291544.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3568321 + 883600 = 1889^2 + 940^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4451921 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (4451929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2225960 + 2225961.

It is an arithmetic number, because the mean of its divisors is an integer number (2225961).

Almost surely, 2^4451921 is an apocalyptic number.

It is an amenable number.

4451921 is a deficient number, since it is larger than the sum of its proper divisors (1).

4451921 is an equidigital number, since it uses as much as digits as its factorization.

4451921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1440, while the sum is 26.

The square root of 4451921 is about 2109.9575825120. The cubic root of 4451921 is about 164.5062804979.

The spelling of 4451921 in words is "four million, four hundred fifty-one thousand, nine hundred twenty-one".