12156031989 has 14 divisors (see below), whose sum is σ = 18225711606. Its totient is φ = 8104020840.

The previous prime is 12156031939. The next prime is 12156031991. The reversal of 12156031989 is 98913065121.

12156031989 is a `hidden beast` number, since 1 + 2 + 1 + 560 + 3 + 1 + 9 + 89 = 666.

It can be written as a sum of positive squares in only one way, i.e., 7563259089 + 4592772900 = 86967^2 + 67770^2 .

It is not a de Polignac number, because 12156031989 - 2⁸ = 12156031733 is a prime.

It is a super-2 number, since 2×12156031989² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12156031939) by changing a digit.

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 13 ways as a sum of consecutive naturals, for example, 8336742 + ... + 8338199.

Almost surely, 2^12156031989 is an apocalyptic number.

It is an amenable number.

12156031989 is a deficient number, since it is larger than the sum of its proper divisors (6069679617).

12156031989 is an frugal number, since it uses more digits than its factorization.

12156031989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16674959 (or 16674944 counting only the distinct ones).

The product of its (nonzero) digits is 116640, while the sum is 45.

The spelling of 12156031989 in words is "twelve billion, one hundred fifty-six million, thirty-one thousand, nine hundred eighty-nine".