12131857 has 8 divisors (see below), whose sum is σ = 12337920. Its totient is φ = 11927520.

The previous prime is 12131849. The next prime is 12131909. The reversal of 12131857 is 75813121.

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

It is a cyclic number.

It is not a de Polignac number, because 12131857 - 2³ = 12131849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12131827) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23868 + ... + 24370.

It is an arithmetic number, because the mean of its divisors is an integer number (1542240).

Almost surely, 2^12131857 is an apocalyptic number.

It is an amenable number.

12131857 is a deficient number, since it is larger than the sum of its proper divisors (206063).

12131857 is an equidigital number, since it uses as much as digits as its factorization.

12131857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 863.

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

The square root of 12131857 is about 3483.0815379488. The cubic root of 12131857 is about 229.7783434787.

Adding to 12131857 its reverse (75813121), we get a palindrome (87944978).

The spelling of 12131857 in words is "twelve million, one hundred thirty-one thousand, eight hundred fifty-seven".