517138489 has 4 divisors (see below), whose sum is σ = 591015424. Its totient is φ = 443261556.

The previous prime is 517138477. The next prime is 517138493. The reversal of 517138489 is 984831715.

It is a happy number.

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 517138489 - 2²³ = 508749881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (517138429) 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, 36938457 + ... + 36938470.

It is an arithmetic number, because the mean of its divisors is an integer number (147753856).

Almost surely, 2^517138489 is an apocalyptic number.

It is an amenable number.

517138489 is a deficient number, since it is larger than the sum of its proper divisors (73876935).

517138489 is an equidigital number, since it uses as much as digits as its factorization.

517138489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73876934.

The product of its digits is 241920, while the sum is 46.

The square root of 517138489 is about 22740.6791675183. The cubic root of 517138489 is about 802.6673927395.

It can be divided in two parts, 5171 and 38489, that added together give a triangular number (43660 = T₂₉₅).

The spelling of 517138489 in words is "five hundred seventeen million, one hundred thirty-eight thousand, four hundred eighty-nine".