1489856491 has 2 divisors, whose sum is σ = 1489856492. Its totient is φ = 1489856490.

The previous prime is 1489856477. The next prime is 1489856503. The reversal of 1489856491 is 1946589841.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1489856491 is a prime.

It is not a weakly prime, because it can be changed into another prime (1489856191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 744928245 + 744928246.

It is an arithmetic number, because the mean of its divisors is an integer number (744928246).

Almost surely, 2^1489856491 is an apocalyptic number.

1489856491 is a deficient number, since it is larger than the sum of its proper divisors (1).

1489856491 is an equidigital number, since it uses as much as digits as its factorization.

1489856491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2488320, while the sum is 55.

The square root of 1489856491 is about 38598.6591865572. The cubic root of 1489856491 is about 1142.1280888979.

The spelling of 1489856491 in words is "one billion, four hundred eighty-nine million, eight hundred fifty-six thousand, four hundred ninety-one".