1718312399 has 2 divisors, whose sum is σ = 1718312400. Its totient is φ = 1718312398.

The previous prime is 1718312377. The next prime is 1718312429. The reversal of 1718312399 is 9932138171.

It is a weak prime.

It is an emirp because it is prime and its reverse (9932138171) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1718312399 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1718312369) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 859156199 + 859156200.

It is an arithmetic number, because the mean of its divisors is an integer number (859156200).

Almost surely, 2^1718312399 is an apocalyptic number.

1718312399 is a deficient number, since it is larger than the sum of its proper divisors (1).

1718312399 is an equidigital number, since it uses as much as digits as its factorization.

1718312399 is an evil number, because the sum of its binary digits is even.

The product of its digits is 81648, while the sum is 44.

The square root of 1718312399 is about 41452.5318768347. The cubic root of 1718312399 is about 1197.7532959946.

The spelling of 1718312399 in words is "one billion, seven hundred eighteen million, three hundred twelve thousand, three hundred ninety-nine".