12831121 has 4 divisors (see below), whose sum is σ = 12892144. Its totient is φ = 12770100.

The previous prime is 12831097. The next prime is 12831127. The reversal of 12831121 is 12113821.

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: 12113821 = 59 ⋅205319.

It is a cyclic number.

It is not a de Polignac number, because 12831121 - 2¹⁵ = 12798353 is a prime.

It is a super-2 number, since 2×12831121² = 329275332233282, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12831127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30195 + ... + 30616.

It is an arithmetic number, because the mean of its divisors is an integer number (3223036).

Almost surely, 2^12831121 is an apocalyptic number.

It is an amenable number.

12831121 is a deficient number, since it is larger than the sum of its proper divisors (61023).

12831121 is an equidigital number, since it uses as much as digits as its factorization.

12831121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61022.

The product of its digits is 96, while the sum is 19.

The square root of 12831121 is about 3582.0554155401. The cubic root of 12831121 is about 234.1108455290.

Adding to 12831121 its reverse (12113821), we get a palindrome (24944942).

It can be divided in two parts, 12831 and 121, that multiplied together give a palindrome (1552551).

The spelling of 12831121 in words is "twelve million, eight hundred thirty-one thousand, one hundred twenty-one".