12131858 has 4 divisors (see below), whose sum is σ = 18197790. Its totient is φ = 6065928.

The previous prime is 12131849. The next prime is 12131909. The reversal of 12131858 is 85813121.

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

It can be written as a sum of positive squares in only one way, i.e., 11242609 + 889249 = 3353^2 + 943^2 .

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 12131858.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 3032963 + ... + 3032966.

Almost surely, 2^12131858 is an apocalyptic number.

12131858 is a deficient number, since it is larger than the sum of its proper divisors (6065932).

12131858 is an equidigital number, since it uses as much as digits as its factorization.

12131858 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6065931.

The product of its digits is 1920, while the sum is 29.

The square root of 12131858 is about 3483.0816814999. The cubic root of 12131858 is about 229.7783497921.

Adding to 12131858 its reverse (85813121), we get a palindrome (97944979).

The spelling of 12131858 in words is "twelve million, one hundred thirty-one thousand, eight hundred fifty-eight".