2091487 has 2 divisors, whose sum is σ = 2091488. Its totient is φ = 2091486.

The previous prime is 2091473. The next prime is 2091497. The reversal of 2091487 is 7841902.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2091487 is a prime.

2091487 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2091437) 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, 1045743 + 1045744.

It is an arithmetic number, because the mean of its divisors is an integer number (1045744).

2^2091487 is an apocalyptic number.

2091487 is a deficient number, since it is larger than the sum of its proper divisors (1).

2091487 is an equidigital number, since it uses as much as digits as its factorization.

2091487 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 2091487 is about 1446.1974277394. The cubic root of 2091487 is about 127.8846413454.

The spelling of 2091487 in words is "two million, ninety-one thousand, four hundred eighty-seven".