320121331 has 4 divisors (see below), whose sum is σ = 320676712. Its totient is φ = 319565952.

The previous prime is 320121313. The next prime is 320121349. The reversal of 320121331 is 133121023.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 133121023 = 7 ⋅19017289.

It is an interprime number because it is at equal distance from previous prime (320121313) and next prime (320121349).

It is a cyclic number.

It is not a de Polignac number, because 320121331 - 2¹³ = 320113139 is a prime.

It is a super-2 number, since 2×320121331² = 204955333122423122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (320121391) 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, 276825 + ... + 277978.

It is an arithmetic number, because the mean of its divisors is an integer number (80169178).

Almost surely, 2^320121331 is an apocalyptic number.

320121331 is a deficient number, since it is larger than the sum of its proper divisors (555381).

320121331 is an equidigital number, since it uses as much as digits as its factorization.

320121331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 555380.

The product of its (nonzero) digits is 108, while the sum is 16.

The square root of 320121331 is about 17891.9348031452. The cubic root of 320121331 is about 684.0768148687.

Adding to 320121331 its reverse (133121023), we get a palindrome (453242354).

The spelling of 320121331 in words is "three hundred twenty million, one hundred twenty-one thousand, three hundred thirty-one".