1329258681 has 15 divisors (see below), whose sum is σ = 1986173013. Its totient is φ = 885953700.

The previous prime is 1329258673. The next prime is 1329258701. The reversal of 1329258681 is 1868529231.

The square root of 1329258681 is 36459.

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

It is not a de Polignac number, because 1329258681 - 2³ = 1329258673 is a prime.

It is a super-2 number, since 2×1329258681² = 3533857282027719522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1329258631) 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 14 ways as a sum of consecutive naturals, for example, 326106 + ... + 330156.

Almost surely, 2^1329258681 is an apocalyptic number.

1329258681 is the 36459-th square number.

1329258681 is the 18230-th centered octagonal number.

It is an amenable number.

1329258681 is a deficient number, since it is larger than the sum of its proper divisors (656914332).

1329258681 is an frugal number, since it uses more digits than its factorization.

1329258681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8114 (or 4054 counting only the distinct ones).

The product of its digits is 207360, while the sum is 45.

The cubic root of 1329258681 is about 1099.5200884492.

The spelling of 1329258681 in words is "one billion, three hundred twenty-nine million, two hundred fifty-eight thousand, six hundred eighty-one".