331640033 has 4 divisors (see below), whose sum is σ = 332253588. Its totient is φ = 331026480.

The previous prime is 331640009. The next prime is 331640039. The reversal of 331640033 is 330046133.

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 66210769 + 265429264 = 8137^2 + 16292^2 .

It is a cyclic number.

It is not a de Polignac number, because 331640033 - 2¹⁶ = 331574497 is a prime.

It is a super-2 number, since 2×331640033² = 219970222976482178, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 331639990 and 331640008.

It is not an unprimeable number, because it can be changed into a prime (331640039) 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, 305966 + ... + 307047.

It is an arithmetic number, because the mean of its divisors is an integer number (83063397).

Almost surely, 2^331640033 is an apocalyptic number.

It is an amenable number.

331640033 is a deficient number, since it is larger than the sum of its proper divisors (613555).

331640033 is an equidigital number, since it uses as much as digits as its factorization.

331640033 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 613554.

The product of its (nonzero) digits is 1944, while the sum is 23.

The square root of 331640033 is about 18210.9866014997. The cubic root of 331640033 is about 692.1852117928.

Adding to 331640033 its reverse (330046133), we get a palindrome (661686166).

The spelling of 331640033 in words is "three hundred thirty-one million, six hundred forty thousand, thirty-three".