2991397 has 2 divisors, whose sum is σ = 2991398. Its totient is φ = 2991396.

The previous prime is 2991377. The next prime is 2991421. The reversal of 2991397 is 7931992.

2991397 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2979076 + 12321 = 1726^2 + 111^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2991397 is a prime.

2991397 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2991367) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1495698 + 1495699.

It is an arithmetic number, because the mean of its divisors is an integer number (1495699).

2^2991397 is an apocalyptic number.

It is an amenable number.

2991397 is a deficient number, since it is larger than the sum of its proper divisors (1).

2991397 is an equidigital number, since it uses as much as digits as its factorization.

2991397 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 30618, while the sum is 40.

The square root of 2991397 is about 1729.5655523859. The cubic root of 2991397 is about 144.0869620047.

The spelling of 2991397 in words is "two million, nine hundred ninety-one thousand, three hundred ninety-seven".