1318791403 has 4 divisors (see below), whose sum is σ = 1319140368. Its totient is φ = 1318442440.

The previous prime is 1318791389. The next prime is 1318791413. The reversal of 1318791403 is 3041978131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3041978131 = 1171 ⋅2597761.

It is a cyclic number.

It is not a de Polignac number, because 1318791403 - 2¹⁷ = 1318660331 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1318791413) 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 in 3 ways as a sum of consecutive naturals, for example, 168751 + ... + 176392.

It is an arithmetic number, because the mean of its divisors is an integer number (329785092).

Almost surely, 2^1318791403 is an apocalyptic number.

1318791403 is a deficient number, since it is larger than the sum of its proper divisors (348965).

1318791403 is an equidigital number, since it uses as much as digits as its factorization.

1318791403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 348964.

The product of its (nonzero) digits is 18144, while the sum is 37.

The square root of 1318791403 is about 36315.1676713739. The cubic root of 1318791403 is about 1096.6264142780.

The spelling of 1318791403 in words is "one billion, three hundred eighteen million, seven hundred ninety-one thousand, four hundred three".