4571921 has 2 divisors, whose sum is σ = 4571922. Its totient is φ = 4571920.

The previous prime is 4571893. The next prime is 4571923. The reversal of 4571921 is 1291754.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4456321 + 115600 = 2111^2 + 340^2 .

It is a cyclic number.

It is not a de Polignac number, because 4571921 - 2⁶ = 4571857 is a prime.

It is a Sophie Germain prime.

Together with 4571923, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (4571923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2285960 + 2285961.

It is an arithmetic number, because the mean of its divisors is an integer number (2285961).

Almost surely, 2^4571921 is an apocalyptic number.

It is an amenable number.

4571921 is a deficient number, since it is larger than the sum of its proper divisors (1).

4571921 is an equidigital number, since it uses as much as digits as its factorization.

4571921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2520, while the sum is 29.

The square root of 4571921 is about 2138.2050883861. The cubic root of 4571921 is about 165.9712656511.

The spelling of 4571921 in words is "four million, five hundred seventy-one thousand, nine hundred twenty-one".