8505401 has 2 divisors, whose sum is σ = 8505402. Its totient is φ = 8505400.

The previous prime is 8505391. The next prime is 8505403. The reversal of 8505401 is 1045058.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7295401 + 1210000 = 2701^2 + 1100^2 .

It is a cyclic number.

It is not a de Polignac number, because 8505401 - 2⁶ = 8505337 is a prime.

It is a Sophie Germain prime.

Together with 8505403, it forms a pair of twin primes.

It is a Chen prime.

It is an Ulam number.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (8505403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4252700 + 4252701.

It is an arithmetic number, because the mean of its divisors is an integer number (4252701).

Almost surely, 2^8505401 is an apocalyptic number.

It is an amenable number.

8505401 is a deficient number, since it is larger than the sum of its proper divisors (1).

8505401 is an equidigital number, since it uses as much as digits as its factorization.

8505401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 800, while the sum is 23.

The square root of 8505401 is about 2916.4020641880. The cubic root of 8505401 is about 204.1259714716.

The spelling of 8505401 in words is "eight million, five hundred five thousand, four hundred one".