516605221 has 4 divisors (see below), whose sum is σ = 563569344. Its totient is φ = 469641100.

The previous prime is 516605213. The next prime is 516605227. The reversal of 516605221 is 122506615.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 516605221 - 2³ = 516605213 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 516605221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (516605227) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23482045 + ... + 23482066.

It is an arithmetic number, because the mean of its divisors is an integer number (140892336).

Almost surely, 2^516605221 is an apocalyptic number.

It is an amenable number.

516605221 is a deficient number, since it is larger than the sum of its proper divisors (46964123).

516605221 is a wasteful number, since it uses less digits than its factorization.

516605221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46964122.

The product of its (nonzero) digits is 3600, while the sum is 28.

The square root of 516605221 is about 22728.9511636591. The cubic root of 516605221 is about 802.3913970068.

The spelling of 516605221 in words is "five hundred sixteen million, six hundred five thousand, two hundred twenty-one".