1309645382405 has 8 divisors (see below), whose sum is σ = 1578095516184. Its totient is φ = 1043368934400.

The previous prime is 1309645382393. The next prime is 1309645382431. The reversal of 1309645382405 is 5042835469031.

It can be written as a sum of positive squares in 4 ways, for example, as 42384103876 + 1267261278529 = 205874^2 + 1125727^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1309645382405 - 2¹⁴ = 1309645366021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 543420116 + ... + 543422525.

It is an arithmetic number, because the mean of its divisors is an integer number (197261939523).

Almost surely, 2^{1309645382405} is an apocalyptic number.

It is an amenable number.

1309645382405 is a deficient number, since it is larger than the sum of its proper divisors (268450133779).

1309645382405 is a wasteful number, since it uses less digits than its factorization.

1309645382405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1086842887.

The product of its (nonzero) digits is 3110400, while the sum is 50.

The spelling of 1309645382405 in words is "one trillion, three hundred nine billion, six hundred forty-five million, three hundred eighty-two thousand, four hundred five".