331318397 has 4 divisors (see below), whose sum is σ = 339023520. Its totient is φ = 323613276.

The previous prime is 331318357. The next prime is 331318399. The reversal of 331318397 is 793813133.

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: 793813133 = 37 ⋅21454409.

It is a cyclic number.

It is not a de Polignac number, because 331318397 - 2¹⁶ = 331252861 is a prime.

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 331318397.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (331318399) 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, 3852497 + ... + 3852582.

It is an arithmetic number, because the mean of its divisors is an integer number (84755880).

Almost surely, 2^331318397 is an apocalyptic number.

It is an amenable number.

331318397 is a deficient number, since it is larger than the sum of its proper divisors (7705123).

331318397 is an equidigital number, since it uses as much as digits as its factorization.

331318397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7705122.

The product of its digits is 40824, while the sum is 38.

The square root of 331318397 is about 18202.1536363146. The cubic root of 331318397 is about 691.9613710102.

The spelling of 331318397 in words is "three hundred thirty-one million, three hundred eighteen thousand, three hundred ninety-seven".