1587491 has 2 divisors, whose sum is σ = 1587492. Its totient is φ = 1587490.

The previous prime is 1587473. The next prime is 1587499. The reversal of 1587491 is 1947851.

It is a strong prime.

It is an emirp because it is prime and its reverse (1947851) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1587491 - 2¹⁰ = 1586467 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1587499) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 793745 + 793746.

It is an arithmetic number, because the mean of its divisors is an integer number (793746).

2^1587491 is an apocalyptic number.

1587491 is a deficient number, since it is larger than the sum of its proper divisors (1).

1587491 is an equidigital number, since it uses as much as digits as its factorization.

1587491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10080, while the sum is 35.

The square root of 1587491 is about 1259.9567452893. The cubic root of 1587491 is about 116.6551072447.

The spelling of 1587491 in words is "one million, five hundred eighty-seven thousand, four hundred ninety-one".