1330991709 has 4 divisors (see below), whose sum is σ = 1774655616. Its totient is φ = 887327804.

The previous prime is 1330991689. The next prime is 1330991723. The reversal of 1330991709 is 9071990331.

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, and also an emirpimes, since its reverse is a distinct semiprime: 9071990331 = 3 ⋅3023996777.

It is a cyclic number.

It is not a de Polignac number, because 1330991709 - 2⁵ = 1330991677 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1330991749) 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, 221831949 + ... + 221831954.

It is an arithmetic number, because the mean of its divisors is an integer number (443663904).

Almost surely, 2^1330991709 is an apocalyptic number.

It is an amenable number.

1330991709 is a deficient number, since it is larger than the sum of its proper divisors (443663907).

1330991709 is an equidigital number, since it uses as much as digits as its factorization.

1330991709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 443663906.

The product of its (nonzero) digits is 45927, while the sum is 42.

The square root of 1330991709 is about 36482.7590650707. The cubic root of 1330991709 is about 1099.9977159732.

The spelling of 1330991709 in words is "one billion, three hundred thirty million, nine hundred ninety-one thousand, seven hundred nine".