12131551 has 4 divisors (see below), whose sum is σ = 12166272. Its totient is φ = 12096832.

The previous prime is 12131549. The next prime is 12131563. The reversal of 12131551 is 15513121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 12131551 - 2¹ = 12131549 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12135551) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16831 + ... + 17536.

It is an arithmetic number, because the mean of its divisors is an integer number (3041568).

Almost surely, 2^12131551 is an apocalyptic number.

12131551 is a deficient number, since it is larger than the sum of its proper divisors (34721).

12131551 is an equidigital number, since it uses as much as digits as its factorization.

12131551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34720.

The product of its digits is 150, while the sum is 19.

The square root of 12131551 is about 3483.0376110516. The cubic root of 12131551 is about 229.7764115743.

Adding to 12131551 its reverse (15513121), we get a palindrome (27644672).

The spelling of 12131551 in words is "twelve million, one hundred thirty-one thousand, five hundred fifty-one".