1329402082009 has 3 divisors (see below), whose sum is σ = 1329403235007. Its totient is φ = 1329400929012.

The previous prime is 1329402081971. The next prime is 1329402082051. The reversal of 1329402082009 is 9002802049231.

The square root of 1329402082009 is 1152997.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 1253761681225 + 75640400784 = 1119715^2 + 275028^2 .

It is not a de Polignac number, because 1329402082009 - 2⁷ = 1329402081881 is a prime.

It is a super-2 number, since 2×1329402082009² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1329402080009) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 576499 + ... + 1729495.

It is an arithmetic number, because the mean of its divisors is an integer number (443134411669).

Almost surely, 2^{1329402082009} is an apocalyptic number.

1329402082009 is the 1152997-th square number.

1329402082009 is the 576499-th centered octagonal number.

It is an amenable number.

1329402082009 is a deficient number, since it is larger than the sum of its proper divisors (1152998).

1329402082009 is an frugal number, since it uses more digits than its factorization.

1329402082009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2305994 (or 1152997 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 40.

The spelling of 1329402082009 in words is "one trillion, three hundred twenty-nine billion, four hundred two million, eighty-two thousand, nine".