917311938139 has 4 divisors (see below), whose sum is σ = 917313854800. Its totient is φ = 917310021480.

The previous prime is 917311938133. The next prime is 917311938149. The reversal of 917311938139 is 931839113719.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 917311938139 - 2⁹ = 917311937627 is a prime.

It is a super-2 number, since 2×917311938139² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 917311938139.

It is not an unprimeable number, because it can be changed into a prime (917311938133) 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, 429769 + ... + 1421029.

It is an arithmetic number, because the mean of its divisors is an integer number (229328463700).

Almost surely, 2^917311938139 is an apocalyptic number.

917311938139 is a deficient number, since it is larger than the sum of its proper divisors (1916661).

917311938139 is an equidigital number, since it uses as much as digits as its factorization.

917311938139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1916660.

The product of its digits is 1102248, while the sum is 55.

The spelling of 917311938139 in words is "nine hundred seventeen billion, three hundred eleven million, nine hundred thirty-eight thousand, one hundred thirty-nine".