479721217 has 2 divisors, whose sum is σ = 479721218. Its totient is φ = 479721216.

The previous prime is 479721211. The next prime is 479721241. The reversal of 479721217 is 712127974.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 334012176 + 145709041 = 18276^2 + 12071^2 .

It is a cyclic number.

It is not a de Polignac number, because 479721217 - 2⁷ = 479721089 is a prime.

It is a super-2 number, since 2×479721217² = 460264892079922178, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 479721217.

It is not a weakly prime, because it can be changed into another prime (479721211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 239860608 + 239860609.

It is an arithmetic number, because the mean of its divisors is an integer number (239860609).

Almost surely, 2^479721217 is an apocalyptic number.

It is an amenable number.

479721217 is a deficient number, since it is larger than the sum of its proper divisors (1).

479721217 is an equidigital number, since it uses as much as digits as its factorization.

479721217 is an evil number, because the sum of its binary digits is even.

The product of its digits is 49392, while the sum is 40.

The square root of 479721217 is about 21902.5390537262. The cubic root of 479721217 is about 782.8219157466.

The spelling of 479721217 in words is "four hundred seventy-nine million, seven hundred twenty-one thousand, two hundred seventeen".