2991887 has 2 divisors, whose sum is σ = 2991888. Its totient is φ = 2991886.

The previous prime is 2991883. The next prime is 2991889. The reversal of 2991887 is 7881992.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2991887 - 2² = 2991883 is a prime.

Together with 2991889, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2991883) 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, 1495943 + 1495944.

It is an arithmetic number, because the mean of its divisors is an integer number (1495944).

2^2991887 is an apocalyptic number.

2991887 is a deficient number, since it is larger than the sum of its proper divisors (1).

2991887 is an equidigital number, since it uses as much as digits as its factorization.

2991887 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 72576, while the sum is 44.

The square root of 2991887 is about 1729.7072006556. The cubic root of 2991887 is about 144.0948288706.

The spelling of 2991887 in words is "two million, nine hundred ninety-one thousand, eight hundred eighty-seven".