331121 has 4 divisors (see below), whose sum is σ = 378432. Its totient is φ = 283812.

The previous prime is 331099. The next prime is 331127. The reversal of 331121 is 121133.

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: 121133 = 29 ⋅4177.

It is a cyclic number.

It is not a de Polignac number, because 331121 - 2¹⁰ = 330097 is a prime.

It is a super-2 number, since 2×331121² = 219282233282, which contains 22 as substring.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 331121.

It is not an unprimeable number, because it can be changed into a prime (331127) 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, 23645 + ... + 23658.

It is an arithmetic number, because the mean of its divisors is an integer number (94608).

2³³¹¹²¹ is an apocalyptic number.

It is an amenable number.

331121 is a deficient number, since it is larger than the sum of its proper divisors (47311).

331121 is an equidigital number, since it uses as much as digits as its factorization.

331121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47310.

The product of its digits is 18, while the sum is 11.

The square root of 331121 is about 575.4311427095. The cubic root of 331121 is about 69.1823921922.

Adding to 331121 its reverse (121133), we get a palindrome (452254).

The spelling of 331121 in words is "three hundred thirty-one thousand, one hundred twenty-one".