1031320139 has 2 divisors, whose sum is σ = 1031320140. Its totient is φ = 1031320138.

The previous prime is 1031320117. The next prime is 1031320141. The reversal of 1031320139 is 9310231301.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1031320139 is a prime.

Together with 1031320141, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1031320439) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 515660069 + 515660070.

It is an arithmetic number, because the mean of its divisors is an integer number (515660070).

Almost surely, 2^1031320139 is an apocalyptic number.

1031320139 is a deficient number, since it is larger than the sum of its proper divisors (1).

1031320139 is an equidigital number, since it uses as much as digits as its factorization.

1031320139 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 486, while the sum is 23.

The square root of 1031320139 is about 32114.1734908436. The cubic root of 1031320139 is about 1010.3329095683.

The spelling of 1031320139 in words is "one billion, thirty-one million, three hundred twenty thousand, one hundred thirty-nine".