1319999999 has 4 divisors (see below), whose sum is σ = 1320357336. Its totient is φ = 1319642664.

The previous prime is 1319999987. The next prime is 1320000001. The reversal of 1319999999 is 9999999131.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1319999999 is a prime.

It is a Duffinian number.

1319999999 is a modest number, since divided by 99999 gives 13199 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1319999299) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 173069 + ... + 180534.

It is an arithmetic number, because the mean of its divisors is an integer number (330089334).

Almost surely, 2^1319999999 is an apocalyptic number.

1319999999 is a deficient number, since it is larger than the sum of its proper divisors (357337).

1319999999 is an equidigital number, since it uses as much as digits as its factorization.

1319999999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 357336.

The product of its digits is 14348907, while the sum is 68.

The square root of 1319999999 is about 36331.8042354079. The cubic root of 1319999999 is about 1096.9613102095.

The spelling of 1319999999 in words is "one billion, three hundred nineteen million, nine hundred ninety-nine thousand, nine hundred ninety-nine".