500166409 has 2 divisors, whose sum is σ = 500166410. Its totient is φ = 500166408.

The previous prime is 500166397. The next prime is 500166413. The reversal of 500166409 is 904661005.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 329785600 + 170380809 = 18160^2 + 13053^2 .

It is a cyclic number.

It is not a de Polignac number, because 500166409 - 2⁵ = 500166377 is a prime.

It is a super-3 number, since 3×500166409³ (a number of 27 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (503166409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 250083204 + 250083205.

It is an arithmetic number, because the mean of its divisors is an integer number (250083205).

Almost surely, 2^500166409 is an apocalyptic number.

It is an amenable number.

500166409 is a deficient number, since it is larger than the sum of its proper divisors (1).

500166409 is an equidigital number, since it uses as much as digits as its factorization.

500166409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 500166409 is about 22364.4004838046. The cubic root of 500166409 is about 793.7885688246.

The spelling of 500166409 in words is "five hundred million, one hundred sixty-six thousand, four hundred nine".