1989522561 has 16 divisors (see below), whose sum is σ = 2857675520. Its totient is φ = 1223925120.

The previous prime is 1989522541. The next prime is 1989522569. The reversal of 1989522561 is 1652259891.

It is not a de Polignac number, because 1989522561 - 2¹¹ = 1989520513 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1989522561.

It is not an unprimeable number, because it can be changed into a prime (1989522569) 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, 154125 + ... + 166533.

It is an arithmetic number, because the mean of its divisors is an integer number (178604720).

Almost surely, 2^1989522561 is an apocalyptic number.

It is an amenable number.

1989522561 is a deficient number, since it is larger than the sum of its proper divisors (868152959).

1989522561 is a wasteful number, since it uses less digits than its factorization.

1989522561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16536.

The product of its digits is 388800, while the sum is 48.

The square root of 1989522561 is about 44604.0644000073. The cubic root of 1989522561 is about 1257.7170724052.

The spelling of 1989522561 in words is "one billion, nine hundred eighty-nine million, five hundred twenty-two thousand, five hundred sixty-one".