1318261393 has 4 divisors (see below), whose sum is σ = 1331313588. Its totient is φ = 1305209200.

The previous prime is 1318261337. The next prime is 1318261403. The reversal of 1318261393 is 3931628131.

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

It can be written as a sum of positive squares in 2 ways, for example, as 626150529 + 692110864 = 25023^2 + 26308^2 .

It is a cyclic number.

It is not a de Polignac number, because 1318261393 - 2¹⁷ = 1318130321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1318261303) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6525946 + ... + 6526147.

It is an arithmetic number, because the mean of its divisors is an integer number (332828397).

Almost surely, 2^1318261393 is an apocalyptic number.

It is an amenable number.

1318261393 is a deficient number, since it is larger than the sum of its proper divisors (13052195).

1318261393 is a wasteful number, since it uses less digits than its factorization.

1318261393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13052194.

The product of its digits is 23328, while the sum is 37.

The square root of 1318261393 is about 36307.8695739643. The cubic root of 1318261393 is about 1096.4794866075.

The spelling of 1318261393 in words is "one billion, three hundred eighteen million, two hundred sixty-one thousand, three hundred ninety-three".