1379509938509 has 4 divisors (see below), whose sum is σ = 1379513905980. Its totient is φ = 1379505971040.

The previous prime is 1379509938481. The next prime is 1379509938533. The reversal of 1379509938509 is 9058399059731.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1165367748484 + 214142190025 = 1079522^2 + 462755^2 .

It is a cyclic number.

It is not a de Polignac number, because 1379509938509 - 2²⁰ = 1379508889933 is a prime.

It is a super-2 number, since 2×1379509938509² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1379509938539) 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 in 3 ways as a sum of consecutive naturals, for example, 1406114 + ... + 2176275.

It is an arithmetic number, because the mean of its divisors is an integer number (344878476495).

Almost surely, 2^{1379509938509} is an apocalyptic number.

It is an amenable number.

1379509938509 is a deficient number, since it is larger than the sum of its proper divisors (3967471).

1379509938509 is an equidigital number, since it uses as much as digits as its factorization.

1379509938509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3967470.

The product of its (nonzero) digits is 82668600, while the sum is 68.

The spelling of 1379509938509 in words is "one trillion, three hundred seventy-nine billion, five hundred nine million, nine hundred thirty-eight thousand, five hundred nine".