1309665797 has 4 divisors (see below), whose sum is σ = 1428726336. Its totient is φ = 1190605260.

The previous prime is 1309665779. The next prime is 1309665809. The reversal of 1309665797 is 7975669031.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1309665797 - 2¹⁰ = 1309664773 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 (1309665197) 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, 59530253 + ... + 59530274.

It is an arithmetic number, because the mean of its divisors is an integer number (357181584).

Almost surely, 2^1309665797 is an apocalyptic number.

It is an amenable number.

1309665797 is a deficient number, since it is larger than the sum of its proper divisors (119060539).

1309665797 is a wasteful number, since it uses less digits than its factorization.

1309665797 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119060538.

The product of its (nonzero) digits is 2143260, while the sum is 53.

The square root of 1309665797 is about 36189.3050085243. The cubic root of 1309665797 is about 1094.0911251963.

The spelling of 1309665797 in words is "one billion, three hundred nine million, six hundred sixty-five thousand, seven hundred ninety-seven".