1309130138 has 4 divisors (see below), whose sum is σ = 1963695210. Its totient is φ = 654565068.

The previous prime is 1309130131. The next prime is 1309130149. The reversal of 1309130138 is 8310319031.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 939606409 + 369523729 = 30653^2 + 19223^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1309130138.

It is not an unprimeable number, because it can be changed into a prime (1309130131) 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, 327282533 + ... + 327282536.

Almost surely, 2^1309130138 is an apocalyptic number.

1309130138 is a deficient number, since it is larger than the sum of its proper divisors (654565072).

1309130138 is an equidigital number, since it uses as much as digits as its factorization.

1309130138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 654565071.

The product of its (nonzero) digits is 1944, while the sum is 29.

The square root of 1309130138 is about 36181.9034601553. The cubic root of 1309130138 is about 1093.9419421813.

Adding to 1309130138 its reverse (8310319031), we get a palindrome (9619449169).

The spelling of 1309130138 in words is "one billion, three hundred nine million, one hundred thirty thousand, one hundred thirty-eight".