6420173 has 2 divisors, whose sum is σ = 6420174. Its totient is φ = 6420172.

The previous prime is 6420109. The next prime is 6420199. The reversal of 6420173 is 3710246.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6086089 + 334084 = 2467^2 + 578^2 .

It is a cyclic number.

It is not a de Polignac number, because 6420173 - 2⁶ = 6420109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6420103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3210086 + 3210087.

It is an arithmetic number, because the mean of its divisors is an integer number (3210087).

Almost surely, 2^6420173 is an apocalyptic number.

It is an amenable number.

6420173 is a deficient number, since it is larger than the sum of its proper divisors (1).

6420173 is an equidigital number, since it uses as much as digits as its factorization.

6420173 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1008, while the sum is 23.

The square root of 6420173 is about 2533.8060304609. The cubic root of 6420173 is about 185.8584211852.

The spelling of 6420173 in words is "six million, four hundred twenty thousand, one hundred seventy-three".