1491587 has 2 divisors, whose sum is σ = 1491588. Its totient is φ = 1491586.

The previous prime is 1491583. The next prime is 1491601. The reversal of 1491587 is 7851941.

It is a weak prime.

It is an emirp because it is prime and its reverse (7851941) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1491587 - 2² = 1491583 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1491583) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 745793 + 745794.

It is an arithmetic number, because the mean of its divisors is an integer number (745794).

2^1491587 is an apocalyptic number.

1491587 is a deficient number, since it is larger than the sum of its proper divisors (1).

1491587 is an equidigital number, since it uses as much as digits as its factorization.

1491587 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 1491587 is about 1221.3054490994. The cubic root of 1491587 is about 114.2570122119.

The spelling of 1491587 in words is "one million, four hundred ninety-one thousand, five hundred eighty-seven".