3001991 has 2 divisors, whose sum is σ = 3001992. Its totient is φ = 3001990.

The previous prime is 3001963. The next prime is 3002003. The reversal of 3001991 is 1991003.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 3001991 - 2⁶ = 3001927 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3001931) 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, 1500995 + 1500996.

It is an arithmetic number, because the mean of its divisors is an integer number (1500996).

Almost surely, 2^3001991 is an apocalyptic number.

3001991 is a deficient number, since it is larger than the sum of its proper divisors (1).

3001991 is an equidigital number, since it uses as much as digits as its factorization.

3001991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 243, while the sum is 23.

The square root of 3001991 is about 1732.6254644325. The cubic root of 3001991 is about 144.2568557406.

Adding to 3001991 its reverse (1991003), we get a palindrome (4992994).

The spelling of 3001991 in words is "three million, one thousand, nine hundred ninety-one".