1001320139 has 2 divisors, whose sum is σ = 1001320140. Its totient is φ = 1001320138.

The previous prime is 1001320097. The next prime is 1001320183. The reversal of 1001320139 is 9310231001.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1001320139 - 2⁸ = 1001319883 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1001320139.

It is not a weakly prime, because it can be changed into another prime (1001322139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 500660069 + 500660070.

It is an arithmetic number, because the mean of its divisors is an integer number (500660070).

Almost surely, 2^1001320139 is an apocalyptic number.

1001320139 is a deficient number, since it is larger than the sum of its proper divisors (1).

1001320139 is an equidigital number, since it uses as much as digits as its factorization.

1001320139 is an odious number, because the sum of its binary digits is odd.

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

The square root of 1001320139 is about 31643.6429476759. The cubic root of 1001320139 is about 1000.4398528345.

The spelling of 1001320139 in words is "one billion, one million, three hundred twenty thousand, one hundred thirty-nine".