501065721 has 24 divisors (see below), whose sum is σ = 782361216. Its totient is φ = 307190880.

The previous prime is 501065711. The next prime is 501065723. The reversal of 501065721 is 127560105.

501065721 is a `hidden beast` number, since 5 + 0 + 1 + 0 + 657 + 2 + 1 = 666.

It is not a de Polignac number, because 501065721 - 2²⁶ = 433956857 is a prime.

It is a super-2 number, since 2×501065721² = 502133713522499682, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (501065723) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 23806 + ... + 39608.

It is an arithmetic number, because the mean of its divisors is an integer number (32598384).

Almost surely, 2^501065721 is an apocalyptic number.

It is an amenable number.

501065721 is a deficient number, since it is larger than the sum of its proper divisors (281295495).

501065721 is a wasteful number, since it uses less digits than its factorization.

501065721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16093 (or 16090 counting only the distinct ones).

The product of its (nonzero) digits is 2100, while the sum is 27.

The square root of 501065721 is about 22384.4973363263. The cubic root of 501065721 is about 794.2640346903.

The spelling of 501065721 in words is "five hundred one million, sixty-five thousand, seven hundred twenty-one".