1491859 has 2 divisors, whose sum is σ = 1491860. Its totient is φ = 1491858.

The previous prime is 1491851. The next prime is 1491863. The reversal of 1491859 is 9581941.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1491859 - 2³ = 1491851 is a prime.

It is not a weakly prime, because it can be changed into another prime (1491851) 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, 745929 + 745930.

It is an arithmetic number, because the mean of its divisors is an integer number (745930).

2^1491859 is an apocalyptic number.

1491859 is a deficient number, since it is larger than the sum of its proper divisors (1).

1491859 is an equidigital number, since it uses as much as digits as its factorization.

1491859 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12960, while the sum is 37.

The square root of 1491859 is about 1221.4168002774. The cubic root of 1491859 is about 114.2639569445.

The spelling of 1491859 in words is "one million, four hundred ninety-one thousand, eight hundred fifty-nine".