2991971 has 2 divisors, whose sum is σ = 2991972. Its totient is φ = 2991970.

The previous prime is 2991929. The next prime is 2992007. The reversal of 2991971 is 1791992.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2991971 - 2⁶ = 2991907 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (2991671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1495985 + 1495986.

It is an arithmetic number, because the mean of its divisors is an integer number (1495986).

2^2991971 is an apocalyptic number.

2991971 is a deficient number, since it is larger than the sum of its proper divisors (1).

2991971 is an equidigital number, since it uses as much as digits as its factorization.

2991971 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10206, while the sum is 38.

The square root of 2991971 is about 1729.7314820515. The cubic root of 2991971 is about 144.0961773899.

The spelling of 2991971 in words is "two million, nine hundred ninety-one thousand, nine hundred seventy-one".