1311599139 has 4 divisors (see below), whose sum is σ = 1748798856. Its totient is φ = 874399424.

The previous prime is 1311599131. The next prime is 1311599161. The reversal of 1311599139 is 9319951131.

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

It is a cyclic number.

It is not a de Polignac number, because 1311599139 - 2³ = 1311599131 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1311599139.

It is not an unprimeable number, because it can be changed into a prime (1311599131) 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, 218599854 + ... + 218599859.

It is an arithmetic number, because the mean of its divisors is an integer number (437199714).

Almost surely, 2^1311599139 is an apocalyptic number.

1311599139 is a deficient number, since it is larger than the sum of its proper divisors (437199717).

1311599139 is an equidigital number, since it uses as much as digits as its factorization.

1311599139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 437199716.

The product of its digits is 32805, while the sum is 42.

The square root of 1311599139 is about 36216.0066683228. The cubic root of 1311599139 is about 1094.6292299884.

The spelling of 1311599139 in words is "one billion, three hundred eleven million, five hundred ninety-nine thousand, one hundred thirty-nine".