1309768772309 has 4 divisors (see below), whose sum is σ = 1310817427500. Its totient is φ = 1308720117120.

The previous prime is 1309768772281. The next prime is 1309768772339. The reversal of 1309768772309 is 9032778679031.

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 203531811025 + 1106236961284 = 451145^2 + 1051778^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1309768772309 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1309768772339) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 524325722 + ... + 524328219.

It is an arithmetic number, because the mean of its divisors is an integer number (327704356875).

Almost surely, 2^{1309768772309} is an apocalyptic number.

It is an amenable number.

1309768772309 is a deficient number, since it is larger than the sum of its proper divisors (1048655191).

1309768772309 is a wasteful number, since it uses less digits than its factorization.

1309768772309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1048655190.

The product of its (nonzero) digits is 24004512, while the sum is 62.

The spelling of 1309768772309 in words is "one trillion, three hundred nine billion, seven hundred sixty-eight million, seven hundred seventy-two thousand, three hundred nine".