12131535 has 16 divisors (see below), whose sum is σ = 20903904. Its totient is φ = 5972352.

The previous prime is 12131533. The next prime is 12131543. The reversal of 12131535 is 53513121.

It is not a de Polignac number, because 12131535 - 2¹ = 12131533 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12131533) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30912 + ... + 31301.

It is an arithmetic number, because the mean of its divisors is an integer number (1306494).

Almost surely, 2^12131535 is an apocalyptic number.

12131535 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

12131535 is a deficient number, since it is larger than the sum of its proper divisors (8772369).

12131535 is a wasteful number, since it uses less digits than its factorization.

12131535 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62234.

The product of its digits is 450, while the sum is 21.

The square root of 12131535 is about 3483.0353142051. The cubic root of 12131535 is about 229.7763105588.

Adding to 12131535 its reverse (53513121), we get a palindrome (65644656).

The spelling of 12131535 in words is "twelve million, one hundred thirty-one thousand, five hundred thirty-five".