12162991 has 2 divisors, whose sum is σ = 12162992. Its totient is φ = 12162990.

The previous prime is 12162971. The next prime is 12163001. The reversal of 12162991 is 19926121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12162991 - 2⁵ = 12162959 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 (12162901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6081495 + 6081496.

It is an arithmetic number, because the mean of its divisors is an integer number (6081496).

Almost surely, 2^12162991 is an apocalyptic number.

12162991 is a deficient number, since it is larger than the sum of its proper divisors (1).

12162991 is an equidigital number, since it uses as much as digits as its factorization.

12162991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1944, while the sum is 31.

The square root of 12162991 is about 3487.5479925013. The cubic root of 12162991 is about 229.9747357253.

The spelling of 12162991 in words is "twelve million, one hundred sixty-two thousand, nine hundred ninety-one".