12012145031 has 4 divisors (see below), whose sum is σ = 12040677864. Its totient is φ = 11983612200.

The previous prime is 12012145009. The next prime is 12012145069. The reversal of 12012145031 is 13054121021.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12012145031 is a prime.

It is a super-2 number, since 2×12012145031² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12012144994 and 12012145012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12012145631) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14265785 + ... + 14266626.

It is an arithmetic number, because the mean of its divisors is an integer number (3010169466).

Almost surely, 2^12012145031 is an apocalyptic number.

12012145031 is a deficient number, since it is larger than the sum of its proper divisors (28532833).

12012145031 is an equidigital number, since it uses as much as digits as its factorization.

12012145031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28532832.

The product of its (nonzero) digits is 240, while the sum is 20.

Adding to 12012145031 its reverse (13054121021), we get a palindrome (25066266052).

The spelling of 12012145031 in words is "twelve billion, twelve million, one hundred forty-five thousand, thirty-one".