1311230999 has 16 divisors (see below), whose sum is σ = 1429224384. Its totient is φ = 1195776000.

The previous prime is 1311230959. The next prime is 1311231001. The reversal of 1311230999 is 9990321131.

It is a cyclic number.

It is not a de Polignac number, because 1311230999 - 2⁸ = 1311230743 is a prime.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1311230909) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 377129 + ... + 380589.

It is an arithmetic number, because the mean of its divisors is an integer number (89326524).

Almost surely, 2^1311230999 is an apocalyptic number.

1311230999 is a deficient number, since it is larger than the sum of its proper divisors (117993385).

1311230999 is a wasteful number, since it uses less digits than its factorization.

1311230999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3818.

The product of its (nonzero) digits is 13122, while the sum is 38.

The square root of 1311230999 is about 36210.9237523706. The cubic root of 1311230999 is about 1094.5268067960.

The spelling of 1311230999 in words is "one billion, three hundred eleven million, two hundred thirty thousand, nine hundred ninety-nine".