501666201 has 12 divisors (see below), whose sum is σ = 742303380. Its totient is φ = 326286720.

The previous prime is 501666181. The next prime is 501666227. The reversal of 501666201 is 102666105.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 285576201 + 216090000 = 16899^2 + 14700^2 .

It is not a de Polignac number, because 501666201 - 2¹³ = 501658009 is a prime.

It is not an unprimeable number, because it can be changed into a prime (501666401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 679396 + ... + 680133.

It is an arithmetic number, because the mean of its divisors is an integer number (61858615).

Almost surely, 2^501666201 is an apocalyptic number.

It is an amenable number.

501666201 is a deficient number, since it is larger than the sum of its proper divisors (240637179).

501666201 is a wasteful number, since it uses less digits than its factorization.

501666201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1359576 (or 1359573 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 501666201 is about 22397.9061744619. The cubic root of 501666201 is about 794.5811915368.

It can be divided in two parts, 5016 and 66201, that added together give a palindrome (71217).

The spelling of 501666201 in words is "five hundred one million, six hundred sixty-six thousand, two hundred one".