12001131 has 24 divisors (see below), whose sum is σ = 17886960. Its totient is φ = 7750656.

The previous prime is 12001117. The next prime is 12001139. The reversal of 12001131 is 13110021.

It is not a de Polignac number, because 12001131 - 2⁹ = 12000619 is a prime.

It is a super-2 number, since 2×12001131² = 288054290558322, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is not an unprimeable number, because it can be changed into a prime (12001139) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 51391 + ... + 51623.

It is an arithmetic number, because the mean of its divisors is an integer number (745290).

Almost surely, 2^12001131 is an apocalyptic number.

12001131 is a deficient number, since it is larger than the sum of its proper divisors (5885829).

12001131 is a wasteful number, since it uses less digits than its factorization.

12001131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 395 (or 392 counting only the distinct ones).

The product of its (nonzero) digits is 6, while the sum is 9.

The square root of 12001131 is about 3464.2648570801. The cubic root of 12001131 is about 228.9500409059.

Adding to 12001131 its reverse (13110021), we get a palindrome (25111152).

The spelling of 12001131 in words is "twelve million, one thousand, one hundred thirty-one".