517139643 has 16 divisors (see below), whose sum is σ = 732270240. Its totient is φ = 323506176.

The previous prime is 517139599. The next prime is 517139669. The reversal of 517139643 is 346931715.

It is not a de Polignac number, because 517139643 - 2²¹ = 515042491 is a prime.

It is not an unprimeable number, because it can be changed into a prime (517139143) 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 15 ways as a sum of consecutive naturals, for example, 2143 + ... + 32231.

It is an arithmetic number, because the mean of its divisors is an integer number (45766890).

Almost surely, 2^517139643 is an apocalyptic number.

517139643 is a deficient number, since it is larger than the sum of its proper divisors (215130597).

517139643 is a wasteful number, since it uses less digits than its factorization.

517139643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30446.

The product of its digits is 68040, while the sum is 39.

The square root of 517139643 is about 22740.7045405370. The cubic root of 517139643 is about 802.6679897927.

The spelling of 517139643 in words is "five hundred seventeen million, one hundred thirty-nine thousand, six hundred forty-three".