516747321 has 6 divisors (see below), whose sum is σ = 746412810. Its totient is φ = 344498208.

The previous prime is 516747299. The next prime is 516747323. The reversal of 516747321 is 123747615.

It is a happy number.

516747321 is a `hidden beast` number, since 5 + 167 + 473 + 21 = 666.

It can be written as a sum of positive squares in only one way, i.e., 426876921 + 89870400 = 20661^2 + 9480^2 .

It is not a de Polignac number, because 516747321 - 2⁵ = 516747289 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (516747323) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 28708176 + ... + 28708193.

It is an arithmetic number, because the mean of its divisors is an integer number (124402135).

Almost surely, 2^516747321 is an apocalyptic number.

It is an amenable number.

516747321 is a deficient number, since it is larger than the sum of its proper divisors (229665489).

516747321 is a wasteful number, since it uses less digits than its factorization.

516747321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57416375 (or 57416372 counting only the distinct ones).

The product of its digits is 35280, while the sum is 36.

The square root of 516747321 is about 22732.0769178709. The cubic root of 516747321 is about 802.4649601843.

The spelling of 516747321 in words is "five hundred sixteen million, seven hundred forty-seven thousand, three hundred twenty-one".