1284489161 has 4 divisors (see below), whose sum is σ = 1284561300. Its totient is φ = 1284417024.

The previous prime is 1284489149. The next prime is 1284489169. The reversal of 1284489161 is 1619844821.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 4280761 + 1280208400 = 2069^2 + 35780^2 .

It is a cyclic number.

It is not a de Polignac number, because 1284489161 - 2¹⁰ = 1284488137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1284489169) 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 in 3 ways as a sum of consecutive naturals, for example, 11945 + ... + 52073.

It is an arithmetic number, because the mean of its divisors is an integer number (321140325).

Almost surely, 2^1284489161 is an apocalyptic number.

It is an amenable number.

1284489161 is a deficient number, since it is larger than the sum of its proper divisors (72139).

1284489161 is an equidigital number, since it uses as much as digits as its factorization.

1284489161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72138.

The product of its digits is 110592, while the sum is 44.

The square root of 1284489161 is about 35839.7706605386. The cubic root of 1284489161 is about 1087.0348841333.

The spelling of 1284489161 in words is "one billion, two hundred eighty-four million, four hundred eighty-nine thousand, one hundred sixty-one".