1312381139 has 4 divisors (see below), whose sum is σ = 1312798440. Its totient is φ = 1311963840.

The previous prime is 1312381117. The next prime is 1312381153. The reversal of 1312381139 is 9311832131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9311832131 = 7 ⋅1330261733.

It is a cyclic number.

It is not a de Polignac number, because 1312381139 - 2²⁰ = 1311332563 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1312381739) 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, 203897 + ... + 210234.

It is an arithmetic number, because the mean of its divisors is an integer number (328199610).

Almost surely, 2^1312381139 is an apocalyptic number.

1312381139 is a deficient number, since it is larger than the sum of its proper divisors (417301).

1312381139 is an equidigital number, since it uses as much as digits as its factorization.

1312381139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 417300.

The product of its digits is 3888, while the sum is 32.

The square root of 1312381139 is about 36226.8013906831. The cubic root of 1312381139 is about 1094.8467329250.

The spelling of 1312381139 in words is "one billion, three hundred twelve million, three hundred eighty-one thousand, one hundred thirty-nine".