1289144521 has 16 divisors (see below), whose sum is σ = 1499079040. Its totient is φ = 1085736960.

The previous prime is 1289144473. The next prime is 1289144581. The reversal of 1289144521 is 1254419821.

It is not a de Polignac number, because 1289144521 - 2⁹ = 1289144009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1289144581) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 194185 + ... + 200713.

It is an arithmetic number, because the mean of its divisors is an integer number (93692440).

Almost surely, 2^1289144521 is an apocalyptic number.

It is an amenable number.

1289144521 is a deficient number, since it is larger than the sum of its proper divisors (209934519).

1289144521 is an equidigital number, since it uses as much as digits as its factorization.

1289144521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7024.

The product of its digits is 23040, while the sum is 37.

The square root of 1289144521 is about 35904.6587645670. The cubic root of 1289144521 is about 1088.3465436717.

The spelling of 1289144521 in words is "one billion, two hundred eighty-nine million, one hundred forty-four thousand, five hundred twenty-one".