329187681 has 12 divisors (see below), whose sum is σ = 475737808. Its totient is φ = 219345624.

The previous prime is 329187601. The next prime is 329187697. The reversal of 329187681 is 186781923.

It is a de Polignac number, because none of the positive numbers 2^k-329187681 is a prime.

It is a super-2 number, since 2×329187681² = 216729058644315522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (329187601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11526 + ... + 28128.

Almost surely, 2^329187681 is an apocalyptic number.

It is an amenable number.

329187681 is a deficient number, since it is larger than the sum of its proper divisors (146550127).

329187681 is a wasteful number, since it uses less digits than its factorization.

329187681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18812 (or 18809 counting only the distinct ones).

The product of its digits is 145152, while the sum is 45.

The square root of 329187681 is about 18143.5300038333. The cubic root of 329187681 is about 690.4748401341.

The spelling of 329187681 in words is "three hundred twenty-nine million, one hundred eighty-seven thousand, six hundred eighty-one".