495117128939 has 4 divisors (see below), whose sum is σ = 516643960656. Its totient is φ = 473590297224.

The previous prime is 495117128917. The next prime is 495117128981. The reversal of 495117128939 is 939821711594.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 939821711594 = 2 ⋅469910855797.

It is not a de Polignac number, because 495117128939 - 2²⁰ = 495116080363 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (495117128039) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10763415824 + ... + 10763415869.

It is an arithmetic number, because the mean of its divisors is an integer number (129160990164).

Almost surely, 2^495117128939 is an apocalyptic number.

495117128939 is a deficient number, since it is larger than the sum of its proper divisors (21526831717).

495117128939 is a wasteful number, since it uses less digits than its factorization.

495117128939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21526831716.

The product of its digits is 4898880, while the sum is 59.

The spelling of 495117128939 in words is "four hundred ninety-five billion, one hundred seventeen million, one hundred twenty-eight thousand, nine hundred thirty-nine".