501279470721 has 20 divisors (see below), whose sum is σ = 748922362452. Its totient is φ = 334142813088.

The previous prime is 501279470719. The next prime is 501279470723. The reversal of 501279470721 is 127074972105.

501279470721 is a `hidden beast` number, since 50 + 127 + 9 + 470 + 7 + 2 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (501279470719) and next prime (501279470723).

It can be written as a sum of positive squares in 2 ways, for example, as 211474898496 + 289804572225 = 459864^2 + 538335^2 .

It is not a de Polignac number, because 501279470721 - 2¹ = 501279470719 is a prime.

It is a super-2 number, since 2×501279470721² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (501279470723) 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 in 19 ways as a sum of consecutive naturals, for example, 229411 + ... + 1027223.

Almost surely, 2^501279470721 is an apocalyptic number.

It is an amenable number.

501279470721 is a deficient number, since it is larger than the sum of its proper divisors (247642891731).

501279470721 is an equidigital number, since it uses as much as digits as its factorization.

501279470721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 805582 (or 805573 counting only the distinct ones).

The product of its (nonzero) digits is 246960, while the sum is 45.

The spelling of 501279470721 in words is "five hundred one billion, two hundred seventy-nine million, four hundred seventy thousand, seven hundred twenty-one".