4085621 has 2 divisors, whose sum is σ = 4085622. Its totient is φ = 4085620.

The previous prime is 4085603. The next prime is 4085623. The reversal of 4085621 is 1265804.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3845521 + 240100 = 1961^2 + 490^2 .

It is a cyclic number.

It is not a de Polignac number, because 4085621 - 2¹⁴ = 4069237 is a prime.

Together with 4085623, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4085623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2042810 + 2042811.

It is an arithmetic number, because the mean of its divisors is an integer number (2042811).

Almost surely, 2^4085621 is an apocalyptic number.

It is an amenable number.

4085621 is a deficient number, since it is larger than the sum of its proper divisors (1).

4085621 is an equidigital number, since it uses as much as digits as its factorization.

4085621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1920, while the sum is 26.

The square root of 4085621 is about 2021.2919136038. The cubic root of 4085621 is about 159.8647424618.

The spelling of 4085621 in words is "four million, eighty-five thousand, six hundred twenty-one".