1318381366 has 4 divisors (see below), whose sum is σ = 1977572052. Its totient is φ = 659190682.

The previous prime is 1318381343. The next prime is 1318381369. The reversal of 1318381366 is 6631838131.

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: 6631838131 = 283 ⋅23434057.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1318381369) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 329595340 + ... + 329595343.

It is an arithmetic number, because the mean of its divisors is an integer number (494393013).

Almost surely, 2^1318381366 is an apocalyptic number.

1318381366 is a deficient number, since it is larger than the sum of its proper divisors (659190686).

1318381366 is an equidigital number, since it uses as much as digits as its factorization.

1318381366 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 659190685.

The product of its digits is 62208, while the sum is 40.

The square root of 1318381366 is about 36309.5216988602. The cubic root of 1318381366 is about 1096.5127485852.

It can be divided in two parts, 13183 and 81366, that added together give a palindrome (94549).

The spelling of 1318381366 in words is "one billion, three hundred eighteen million, three hundred eighty-one thousand, three hundred sixty-six".