1309664943 has 20 divisors (see below), whose sum is σ = 1959741168. Its totient is φ = 871624800.

The previous prime is 1309664933. The next prime is 1309664957. The reversal of 1309664943 is 3494669031.

It is not a de Polignac number, because 1309664943 - 2¹⁷ = 1309533871 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1309664933) by changing a digit.

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 19 ways as a sum of consecutive naturals, for example, 35230 + ... + 62132.

Almost surely, 2^1309664943 is an apocalyptic number.

1309664943 is a deficient number, since it is larger than the sum of its proper divisors (650076225).

1309664943 is an equidigital number, since it uses as much as digits as its factorization.

1309664943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27516 (or 27507 counting only the distinct ones).

The product of its (nonzero) digits is 419904, while the sum is 45.

The square root of 1309664943 is about 36189.2932094563. The cubic root of 1309664943 is about 1094.0908873865.

The spelling of 1309664943 in words is "one billion, three hundred nine million, six hundred sixty-four thousand, nine hundred forty-three".