4255921 has 2 divisors, whose sum is σ = 4255922. Its totient is φ = 4255920.

The previous prime is 4255913. The next prime is 4255931. The reversal of 4255921 is 1295524.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4243600 + 12321 = 2060^2 + 111^2 .

It is a cyclic number.

It is not a de Polignac number, because 4255921 - 2³ = 4255913 is a prime.

It is a super-2 number, since 2×4255921² = 36225727116482, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 4255921.

It is not a weakly prime, because it can be changed into another prime (4255931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2127960 + 2127961.

It is an arithmetic number, because the mean of its divisors is an integer number (2127961).

Almost surely, 2^4255921 is an apocalyptic number.

It is an amenable number.

4255921 is a deficient number, since it is larger than the sum of its proper divisors (1).

4255921 is an equidigital number, since it uses as much as digits as its factorization.

4255921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3600, while the sum is 28.

The square root of 4255921 is about 2062.9883664238. The cubic root of 4255921 is about 162.0557776737.

The spelling of 4255921 in words is "four million, two hundred fifty-five thousand, nine hundred twenty-one".