516508393 has 4 divisors (see below), whose sum is σ = 517893508. Its totient is φ = 515123280.

The previous prime is 516508387. The next prime is 516508409. The reversal of 516508393 is 393805615.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 136726249 + 379782144 = 11693^2 + 19488^2 .

It is a cyclic number.

It is not a de Polignac number, because 516508393 - 2⁹ = 516507881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (516508793) 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, 691998 + ... + 692743.

It is an arithmetic number, because the mean of its divisors is an integer number (129473377).

Almost surely, 2^516508393 is an apocalyptic number.

It is an amenable number.

516508393 is a deficient number, since it is larger than the sum of its proper divisors (1385115).

516508393 is a wasteful number, since it uses less digits than its factorization.

516508393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1385114.

The product of its (nonzero) digits is 97200, while the sum is 40.

The square root of 516508393 is about 22726.8210051472. The cubic root of 516508393 is about 802.3412627807.

The spelling of 516508393 in words is "five hundred sixteen million, five hundred eight thousand, three hundred ninety-three".