1312139 has 2 divisors, whose sum is σ = 1312140. Its totient is φ = 1312138.

The previous prime is 1312133. The next prime is 1312153. The reversal of 1312139 is 9312131.

It is a weak prime.

It is an emirp because it is prime and its reverse (9312131) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1312139 is a prime.

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 1312139.

It is not a weakly prime, because it can be changed into another prime (1312133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 656069 + 656070.

It is an arithmetic number, because the mean of its divisors is an integer number (656070).

2^1312139 is an apocalyptic number.

1312139 is a deficient number, since it is larger than the sum of its proper divisors (1).

1312139 is an equidigital number, since it uses as much as digits as its factorization.

1312139 is an evil number, because the sum of its binary digits is even.

The product of its digits is 162, while the sum is 20.

The square root of 1312139 is about 1145.4863595871. The cubic root of 1312139 is about 109.4779394408.

The spelling of 1312139 in words is "one million, three hundred twelve thousand, one hundred thirty-nine".