4501921 has 2 divisors, whose sum is σ = 4501922. Its totient is φ = 4501920.

The previous prime is 4501919. The next prime is 4501927. The reversal of 4501921 is 1291054.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4389025 + 112896 = 2095^2 + 336^2 .

It is a cyclic number.

It is not a de Polignac number, because 4501921 - 2¹ = 4501919 is a prime.

Together with 4501919, it forms a pair of twin primes.

4501921 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 4501892 and 4501901.

It is not a weakly prime, because it can be changed into another prime (4501927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2250960 + 2250961.

It is an arithmetic number, because the mean of its divisors is an integer number (2250961).

Almost surely, 2^4501921 is an apocalyptic number.

It is an amenable number.

4501921 is a deficient number, since it is larger than the sum of its proper divisors (1).

4501921 is an equidigital number, since it uses as much as digits as its factorization.

4501921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 360, while the sum is 22.

The square root of 4501921 is about 2121.7730792901. The cubic root of 4501921 is about 165.1198517035.

Adding to 4501921 its reverse (1291054), we get a palindrome (5792975).

The spelling of 4501921 in words is "four million, five hundred one thousand, nine hundred twenty-one".