13431121 has 8 divisors (see below), whose sum is σ = 14774688. Its totient is φ = 12208900.

The previous prime is 13431113. The next prime is 13431127. The reversal of 13431121 is 12113431.

13431121 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 13431121 - 2³ = 13431113 is a prime.

It is a super-2 number, since 2×13431121² = 360790022633282, which contains 22 as substring.

It is a Duffinian number.

It is a nialpdrome in base 11.

It is a junction number, because it is equal to n+sod(n) for n = 13431095 and 13431104.

It is not an unprimeable number, because it can be changed into a prime (13431127) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3715 + ... + 6376.

It is an arithmetic number, because the mean of its divisors is an integer number (1846836).

Almost surely, 2^13431121 is an apocalyptic number.

13431121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

13431121 is a deficient number, since it is larger than the sum of its proper divisors (1343567).

13431121 is an equidigital number, since it uses as much as digits as its factorization.

13431121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10124 (or 10102 counting only the distinct ones).

The product of its digits is 72, while the sum is 16.

The square root of 13431121 is about 3664.8493829897. The cubic root of 13431121 is about 237.7045093513.

Adding to 13431121 its reverse (12113431), we get a palindrome (25544552).

It can be divided in two parts, 13 and 431121, that added together give a palindrome (431134).

The spelling of 13431121 in words is "thirteen million, four hundred thirty-one thousand, one hundred twenty-one".