3120991 has 2 divisors, whose sum is σ = 3120992. Its totient is φ = 3120990.

The previous prime is 3120989. The next prime is 3121007. The reversal of 3120991 is 1990213.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 3120991 - 2¹ = 3120989 is a prime.

Together with 3120989, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3120791) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1560495 + 1560496.

It is an arithmetic number, because the mean of its divisors is an integer number (1560496).

Almost surely, 2^3120991 is an apocalyptic number.

3120991 is a deficient number, since it is larger than the sum of its proper divisors (1).

3120991 is an equidigital number, since it uses as much as digits as its factorization.

3120991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 486, while the sum is 25.

The square root of 3120991 is about 1766.6326726289. The cubic root of 3120991 is about 146.1383407587.

The spelling of 3120991 in words is "three million, one hundred twenty thousand, nine hundred ninety-one".