12131115 has 32 divisors (see below), whose sum is σ = 20782656. Its totient is φ = 6021120.

The previous prime is 12131113. The next prime is 12131159. The reversal of 12131115 is 51113121.

It is not a de Polignac number, because 12131115 - 2¹ = 12131113 is a prime.

It is a super-2 number, since 2×12131115² = 294327902286450, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a junction number, because it is equal to n+sod(n) for n = 12131094 and 12131103.

It is not an unprimeable number, because it can be changed into a prime (12131113) 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 31 ways as a sum of consecutive naturals, for example, 28605 + ... + 29025.

It is an arithmetic number, because the mean of its divisors is an integer number (649458).

Almost surely, 2^12131115 is an apocalyptic number.

12131115 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

12131115 is a deficient number, since it is larger than the sum of its proper divisors (8651541).

12131115 is a wasteful number, since it uses less digits than its factorization.

12131115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 559.

The product of its digits is 30, while the sum is 15.

The square root of 12131115 is about 3482.9750214436. The cubic root of 12131115 is about 229.7736588701.

Adding to 12131115 its reverse (51113121), we get a palindrome (63244236).

It can be divided in two parts, 12131 and 115, that added together give a triangular number (12246 = T₁₅₆).

The spelling of 12131115 in words is "twelve million, one hundred thirty-one thousand, one hundred fifteen".