501288221 has 8 divisors (see below), whose sum is σ = 573571584. Its totient is φ = 429172560.

The previous prime is 501288209. The next prime is 501288223. The reversal of 501288221 is 122882105.

It is a happy number.

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 501288221 - 2⁶ = 501288157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (501288223) 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, 35450 + ... + 47531.

It is an arithmetic number, because the mean of its divisors is an integer number (71696448).

Almost surely, 2^501288221 is an apocalyptic number.

It is an amenable number.

501288221 is a deficient number, since it is larger than the sum of its proper divisors (72283363).

501288221 is an equidigital number, since it uses as much as digits as its factorization.

501288221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83851.

The product of its (nonzero) digits is 2560, while the sum is 29.

The square root of 501288221 is about 22389.4667421982. The cubic root of 501288221 is about 794.3815825412.

The spelling of 501288221 in words is "five hundred one million, two hundred eighty-eight thousand, two hundred twenty-one".