501166621 has 8 divisors (see below), whose sum is σ = 504698040. Its totient is φ = 497645568.

The previous prime is 501166597. The next prime is 501166643. The reversal of 501166621 is 126661105.

It can be written as a sum of positive squares in 4 ways, for example, as 263575225 + 237591396 = 16235^2 + 15414^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 501166621 - 2⁹ = 501166109 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 501166621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (501166691) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 111465 + ... + 115873.

It is an arithmetic number, because the mean of its divisors is an integer number (63087255).

Almost surely, 2^501166621 is an apocalyptic number.

It is an amenable number.

501166621 is a deficient number, since it is larger than the sum of its proper divisors (3531419).

501166621 is a wasteful number, since it uses less digits than its factorization.

501166621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5183.

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 501166621 is about 22386.7510148302. The cubic root of 501166621 is about 794.3173449708.

The spelling of 501166621 in words is "five hundred one million, one hundred sixty-six thousand, six hundred twenty-one".