1329749813 has 4 divisors (see below), whose sum is σ = 1519714080. Its totient is φ = 1139785548.

The previous prime is 1329749779. The next prime is 1329749819. The reversal of 1329749813 is 3189479231.

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: 3189479231 = 10501 ⋅303731.

It is a cyclic number.

It is not a de Polignac number, because 1329749813 - 2²⁴ = 1312972597 is a prime.

It is a super-3 number, since 3×1329749813³ (a number of 28 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1329749819) 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, 94982123 + ... + 94982136.

It is an arithmetic number, because the mean of its divisors is an integer number (379928520).

Almost surely, 2^1329749813 is an apocalyptic number.

It is an amenable number.

1329749813 is a deficient number, since it is larger than the sum of its proper divisors (189964267).

1329749813 is an equidigital number, since it uses as much as digits as its factorization.

1329749813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 189964266.

The product of its digits is 326592, while the sum is 47.

The square root of 1329749813 is about 36465.7347793788. The cubic root of 1329749813 is about 1099.6554879804.

The spelling of 1329749813 in words is "one billion, three hundred twenty-nine million, seven hundred forty-nine thousand, eight hundred thirteen".