1318381431 has 4 divisors (see below), whose sum is σ = 1757841912. Its totient is φ = 878920952.

The previous prime is 1318381411. The next prime is 1318381439. The reversal of 1318381431 is 1341838131.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1318381431 - 2¹¹ = 1318379383 is a prime.

It is a super-2 number, since 2×1318381431² = 3476259195211215522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1318381392 and 1318381401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1318381439) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 219730236 + ... + 219730241.

It is an arithmetic number, because the mean of its divisors is an integer number (439460478).

Almost surely, 2^1318381431 is an apocalyptic number.

1318381431 is a deficient number, since it is larger than the sum of its proper divisors (439460481).

1318381431 is an equidigital number, since it uses as much as digits as its factorization.

1318381431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 439460480.

The product of its digits is 6912, while the sum is 33.

The square root of 1318381431 is about 36309.5225939422. The cubic root of 1318381431 is about 1096.5127666056.

The spelling of 1318381431 in words is "one billion, three hundred eighteen million, three hundred eighty-one thousand, four hundred thirty-one".