12001156 has 6 divisors (see below), whose sum is σ = 21002030. Its totient is φ = 6000576.

The previous prime is 12001153. The next prime is 12001159. The reversal of 12001156 is 65110021.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (12001153) and next prime (12001159).

It can be written as a sum of positive squares in only one way, i.e., 6553600 + 5447556 = 2560^2 + 2334^2 .

It is not an unprimeable number, because it can be changed into a prime (12001153) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1500141 + ... + 1500148.

Almost surely, 2^12001156 is an apocalyptic number.

It is an amenable number.

12001156 is a deficient number, since it is larger than the sum of its proper divisors (9000874).

12001156 is a wasteful number, since it uses less digits than its factorization.

12001156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3000293 (or 3000291 counting only the distinct ones).

The product of its (nonzero) digits is 60, while the sum is 16.

The square root of 12001156 is about 3464.2684653473. The cubic root of 12001156 is about 228.9501998839.

Adding to 12001156 its reverse (65110021), we get a palindrome (77111177).

The spelling of 12001156 in words is "twelve million, one thousand, one hundred fifty-six".