517155139 has 2 divisors, whose sum is σ = 517155140. Its totient is φ = 517155138.

The previous prime is 517155127. The next prime is 517155143. The reversal of 517155139 is 931551715.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-517155139 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 517155098 and 517155107.

It is not a weakly prime, because it can be changed into another prime (517155169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 258577569 + 258577570.

It is an arithmetic number, because the mean of its divisors is an integer number (258577570).

Almost surely, 2^517155139 is an apocalyptic number.

517155139 is a deficient number, since it is larger than the sum of its proper divisors (1).

517155139 is an equidigital number, since it uses as much as digits as its factorization.

517155139 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 23625, while the sum is 37.

The square root of 517155139 is about 22741.0452486248. The cubic root of 517155139 is about 802.6760069818.

The spelling of 517155139 in words is "five hundred seventeen million, one hundred fifty-five thousand, one hundred thirty-nine".