12016431 has 20 divisors (see below), whose sum is σ = 20515792. Its totient is φ = 6866208.

The previous prime is 12016427. The next prime is 12016439. The reversal of 12016431 is 13461021.

It is a happy number.

12016431 is a `hidden beast` number, since 1 + 20 + 1 + 643 + 1 = 666.

It is not a de Polignac number, because 12016431 - 2² = 12016427 is a prime.

It is a super-2 number, since 2×12016431² = 288789227955522, which 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 (12016439) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 10030 + ... + 11163.

Almost surely, 2^12016431 is an apocalyptic number.

12016431 is a deficient number, since it is larger than the sum of its proper divisors (8499361).

12016431 is an equidigital number, since it uses as much as digits as its factorization.

12016431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21212 (or 21203 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 12016431 is about 3466.4724144294. The cubic root of 12016431 is about 229.0472941862.

Adding to 12016431 its reverse (13461021), we get a palindrome (25477452).

The spelling of 12016431 in words is "twelve million, sixteen thousand, four hundred thirty-one".