13031121 has 16 divisors (see below), whose sum is σ = 18164160. Its totient is φ = 8299200.

The previous prime is 13031101. The next prime is 13031159. The reversal of 13031121 is 12113031.

It is not a de Polignac number, because 13031121 - 2¹⁰ = 13030097 is a prime.

It is a super-2 number, since 2×13031121² = 339620229033282, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 13031097 and 13031106.

It is not an unprimeable number, because it can be changed into a prime (13031101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8046 + ... + 9528.

It is an arithmetic number, because the mean of its divisors is an integer number (1135260).

Almost surely, 2^13031121 is an apocalyptic number.

It is an amenable number.

13031121 is a deficient number, since it is larger than the sum of its proper divisors (5133039).

13031121 is a wasteful number, since it uses less digits than its factorization.

13031121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1616.

The product of its (nonzero) digits is 18, while the sum is 12.

The square root of 13031121 is about 3609.8644018855. The cubic root of 13031121 is about 235.3209497256.

Adding to 13031121 its reverse (12113031), we get a palindrome (25144152).

It can be divided in two parts, 13031 and 121, that multiplied together give a palindrome (1576751).

The spelling of 13031121 in words is "thirteen million, thirty-one thousand, one hundred twenty-one".