1318440791 has 2 divisors, whose sum is σ = 1318440792. Its totient is φ = 1318440790.

The previous prime is 1318440787. The next prime is 1318440793. The reversal of 1318440791 is 1970448131.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1318440791 - 2² = 1318440787 is a prime.

It is a super-2 number, since 2×1318440791² = 3476572238745411362, which contains 22 as substring.

Together with 1318440793, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1318440793) 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 as a sum of consecutive naturals, namely, 659220395 + 659220396.

It is an arithmetic number, because the mean of its divisors is an integer number (659220396).

Almost surely, 2^1318440791 is an apocalyptic number.

1318440791 is a deficient number, since it is larger than the sum of its proper divisors (1).

1318440791 is an equidigital number, since it uses as much as digits as its factorization.

1318440791 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24192, while the sum is 38.

The square root of 1318440791 is about 36310.3400011622. The cubic root of 1318440791 is about 1096.5292231533.

The spelling of 1318440791 in words is "one billion, three hundred eighteen million, four hundred forty thousand, seven hundred ninety-one".