12612131 has 4 divisors (see below), whose sum is σ = 14413872. Its totient is φ = 10810392.

The previous prime is 12612109. The next prime is 12612139. The reversal of 12612131 is 13121621.

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-12612131 is a prime.

It is a super-2 number, since 2×12612131² = 318131696722322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12612139) 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, 900860 + ... + 900873.

It is an arithmetic number, because the mean of its divisors is an integer number (3603468).

Almost surely, 2^12612131 is an apocalyptic number.

12612131 is a deficient number, since it is larger than the sum of its proper divisors (1801741).

12612131 is an equidigital number, since it uses as much as digits as its factorization.

12612131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1801740.

The product of its digits is 72, while the sum is 17.

The square root of 12612131 is about 3551.3562198124. The cubic root of 12612131 is about 232.7713315882.

Adding to 12612131 its reverse (13121621), we get a palindrome (25733752).

The spelling of 12612131 in words is "twelve million, six hundred twelve thousand, one hundred thirty-one".