1312302139 has 2 divisors, whose sum is σ = 1312302140. Its totient is φ = 1312302138.

The previous prime is 1312302067. The next prime is 1312302151. The reversal of 1312302139 is 9312032131.

It is a strong prime.

It is an emirp because it is prime and its reverse (9312032131) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1312302139 - 2⁷ = 1312302011 is a prime.

It is not a weakly prime, because it can be changed into another prime (1312302169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 656151069 + 656151070.

It is an arithmetic number, because the mean of its divisors is an integer number (656151070).

Almost surely, 2^1312302139 is an apocalyptic number.

1312302139 is a deficient number, since it is larger than the sum of its proper divisors (1).

1312302139 is an equidigital number, since it uses as much as digits as its factorization.

1312302139 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 972, while the sum is 25.

The square root of 1312302139 is about 36225.7110213174. The cubic root of 1312302139 is about 1094.8247640460.

The spelling of 1312302139 in words is "one billion, three hundred twelve million, three hundred two thousand, one hundred thirty-nine".