1318725899 has 2 divisors, whose sum is σ = 1318725900. Its totient is φ = 1318725898.

The previous prime is 1318725871. The next prime is 1318725901. The reversal of 1318725899 is 9985278131.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1318725899 - 2⁸ = 1318725643 is a prime.

It is a super-3 number, since 3×1318725899³ (a number of 28 digits) contains 333 as substring.

Together with 1318725901, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1318725899.

It is not a weakly prime, because it can be changed into another prime (1318725299) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 659362949 + 659362950.

It is an arithmetic number, because the mean of its divisors is an integer number (659362950).

Almost surely, 2^1318725899 is an apocalyptic number.

1318725899 is a deficient number, since it is larger than the sum of its proper divisors (1).

1318725899 is an equidigital number, since it uses as much as digits as its factorization.

1318725899 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1088640, while the sum is 53.

The square root of 1318725899 is about 36314.2657780658. The cubic root of 1318725899 is about 1096.6082576016.

The spelling of 1318725899 in words is "one billion, three hundred eighteen million, seven hundred twenty-five thousand, eight hundred ninety-nine".