12131657438 has 8 divisors (see below), whose sum is σ = 18469090632. Its totient is φ = 5975293896.

The previous prime is 12131657413. The next prime is 12131657449. The reversal of 12131657438 is 83475613121.

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

It is a super-2 number, since 2×12131657438² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 12131657395 and 12131657404.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45267245 + ... + 45267512.

It is an arithmetic number, because the mean of its divisors is an integer number (2308636329).

Almost surely, 2^12131657438 is an apocalyptic number.

12131657438 is a deficient number, since it is larger than the sum of its proper divisors (6337433194).

12131657438 is an equidigital number, since it uses as much as digits as its factorization.

12131657438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90534826.

The product of its digits is 120960, while the sum is 41.

The spelling of 12131657438 in words is "twelve billion, one hundred thirty-one million, six hundred fifty-seven thousand, four hundred thirty-eight".