12157831447 has 4 divisors (see below), whose sum is σ = 12160217176. Its totient is φ = 12155445720.

The previous prime is 12157831423. The next prime is 12157831459. The reversal of 12157831447 is 74413875121.

12157831447 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 12157831447 - 2¹¹ = 12157829399 is a prime.

It is a super-2 number, since 2×12157831447² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12157841447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1185204 + ... + 1195417.

It is an arithmetic number, because the mean of its divisors is an integer number (3040054294).

Almost surely, 2^12157831447 is an apocalyptic number.

12157831447 is a deficient number, since it is larger than the sum of its proper divisors (2385729).

12157831447 is an equidigital number, since it uses as much as digits as its factorization.

12157831447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2385728.

The product of its digits is 188160, while the sum is 43.

The spelling of 12157831447 in words is "twelve billion, one hundred fifty-seven million, eight hundred thirty-one thousand, four hundred forty-seven".