1318717331 has 4 divisors (see below), whose sum is σ = 1319952000. Its totient is φ = 1317482664.

The previous prime is 1318717303. The next prime is 1318717349. The reversal of 1318717331 is 1337178131.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1337178131 = 1847 ⋅723973.

It is a cyclic number.

It is not a de Polignac number, because 1318717331 - 2¹⁰ = 1318716307 is a prime.

It is a super-2 number, since 2×1318717331² = 3478030798159527122, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1318717291 and 1318717300.

It is not an unprimeable number, because it can be changed into a prime (1318717381) 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, 615731 + ... + 617868.

It is an arithmetic number, because the mean of its divisors is an integer number (329988000).

Almost surely, 2^1318717331 is an apocalyptic number.

1318717331 is a deficient number, since it is larger than the sum of its proper divisors (1234669).

1318717331 is a wasteful number, since it uses less digits than its factorization.

1318717331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1234668.

The product of its digits is 10584, while the sum is 35.

The square root of 1318717331 is about 36314.1478077071. The cubic root of 1318717331 is about 1096.6058826426.

The spelling of 1318717331 in words is "one billion, three hundred eighteen million, seven hundred seventeen thousand, three hundred thirty-one".