330001981 has 4 divisors (see below), whose sum is σ = 330349212. Its totient is φ = 329654752.

The previous prime is 330001967. The next prime is 330002041. The reversal of 330001981 is 189100033.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 189200025 + 140801956 = 13755^2 + 11866^2 .

It is a cyclic number.

It is not a de Polignac number, because 330001981 - 2⁵ = 330001949 is a prime.

It is a super-2 number, since 2×330001981² = 217802614927848722, which contains 22 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 (330001961) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 172186 + ... + 174091.

It is an arithmetic number, because the mean of its divisors is an integer number (82587303).

Almost surely, 2^330001981 is an apocalyptic number.

It is an amenable number.

330001981 is a deficient number, since it is larger than the sum of its proper divisors (347231).

330001981 is an equidigital number, since it uses as much as digits as its factorization.

330001981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 347230.

The product of its (nonzero) digits is 648, while the sum is 25.

The square root of 330001981 is about 18165.9566497336. The cubic root of 330001981 is about 691.0437057810.

The spelling of 330001981 in words is "three hundred thirty million, one thousand, nine hundred eighty-one".