12156791 has 2 divisors, whose sum is σ = 12156792. Its totient is φ = 12156790.

The previous prime is 12156733. The next prime is 12156797. The reversal of 12156791 is 19765121.

It is a strong prime.

It is an emirp because it is prime and its reverse (19765121) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12156791 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12156797) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6078395 + 6078396.

It is an arithmetic number, because the mean of its divisors is an integer number (6078396).

Almost surely, 2^12156791 is an apocalyptic number.

12156791 is a deficient number, since it is larger than the sum of its proper divisors (1).

12156791 is an equidigital number, since it uses as much as digits as its factorization.

12156791 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3780, while the sum is 32.

The square root of 12156791 is about 3486.6590025410. The cubic root of 12156791 is about 229.9356530769.

The spelling of 12156791 in words is "twelve million, one hundred fifty-six thousand, seven hundred ninety-one".