12131578 has 8 divisors (see below), whose sum is σ = 18446868. Its totient is φ = 5982624.

The previous prime is 12131573. The next prime is 12131621. The reversal of 12131578 is 87513121.

It can be written as a sum of positive squares in 2 ways, for example, as 12131289 + 289 = 3483^2 + 17^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (12131573) 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, 41401 + ... + 41692.

Almost surely, 2^12131578 is an apocalyptic number.

12131578 is a deficient number, since it is larger than the sum of its proper divisors (6315290).

12131578 is an equidigital number, since it uses as much as digits as its factorization.

12131578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83168.

The product of its digits is 1680, while the sum is 28.

The square root of 12131578 is about 3483.0414869766. The cubic root of 12131578 is about 229.7765820378.

Adding to 12131578 its reverse (87513121), we get a palindrome (99644699).

The spelling of 12131578 in words is "twelve million, one hundred thirty-one thousand, five hundred seventy-eight".