31347255139 has 2 divisors, whose sum is σ = 31347255140. Its totient is φ = 31347255138.

The previous prime is 31347255091. The next prime is 31347255193. The reversal of 31347255139 is 93155274313.

Together with next prime (31347255193) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is an emirp because it is prime and its reverse (93155274313) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31347255139 - 2²⁷ = 31213037411 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31347255095 and 31347255104.

It is not a weakly prime, because it can be changed into another prime (31347255739) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15673627569 + 15673627570.

It is an arithmetic number, because the mean of its divisors is an integer number (15673627570).

Almost surely, 2^31347255139 is an apocalyptic number.

31347255139 is a deficient number, since it is larger than the sum of its proper divisors (1).

31347255139 is an equidigital number, since it uses as much as digits as its factorization.

31347255139 is an evil number, because the sum of its binary digits is even.

The product of its digits is 340200, while the sum is 43.

The spelling of 31347255139 in words is "thirty-one billion, three hundred forty-seven million, two hundred fifty-five thousand, one hundred thirty-nine".