331331313 has 4 divisors (see below), whose sum is σ = 441775088. Its totient is φ = 220887540.

The previous prime is 331331311. The next prime is 331331347. The reversal of 331331313 is 313133133.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 313133133 = 3 ⋅104377711.

It is not a de Polignac number, because 331331313 - 2¹ = 331331311 is a prime.

It is a nude number because it is divisible by every one of its digits.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 331331313.

It is not an unprimeable number, because it can be changed into a prime (331331311) 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, 55221883 + ... + 55221888.

It is an arithmetic number, because the mean of its divisors is an integer number (110443772).

Almost surely, 2^331331313 is an apocalyptic number.

It is an amenable number.

331331313 is a deficient number, since it is larger than the sum of its proper divisors (110443775).

331331313 is a wasteful number, since it uses less digits than its factorization.

331331313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110443774.

The product of its digits is 729, while the sum is 21.

The square root of 331331313 is about 18202.5084260384. The cubic root of 331331313 is about 691.9703626197.

Adding to 331331313 its reverse (313133133), we get a palindrome (644464446).

The spelling of 331331313 in words is "three hundred thirty-one million, three hundred thirty-one thousand, three hundred thirteen".