331306643 has 4 divisors (see below), whose sum is σ = 342731040. Its totient is φ = 319882248.

The previous prime is 331306603. The next prime is 331306663. The reversal of 331306643 is 346603133.

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

It is a cyclic number.

It is not a de Polignac number, because 331306643 - 2¹² = 331302547 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29), and also a Moran number because the ratio is a prime number: 11424367 = 331306643 / (3 + 3 + 1 + 3 + 0 + 6 + 6 + 4 + 3).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (331306603) 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, 5712155 + ... + 5712212.

It is an arithmetic number, because the mean of its divisors is an integer number (85682760).

Almost surely, 2^331306643 is an apocalyptic number.

331306643 is a deficient number, since it is larger than the sum of its proper divisors (11424397).

331306643 is a wasteful number, since it uses less digits than its factorization.

331306643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11424396.

The product of its (nonzero) digits is 11664, while the sum is 29.

The square root of 331306643 is about 18201.8307595692. The cubic root of 331306643 is about 691.9531881361.

Adding to 331306643 its reverse (346603133), we get a palindrome (677909776).

The spelling of 331306643 in words is "three hundred thirty-one million, three hundred six thousand, six hundred forty-three".