1689553561 has 8 divisors (see below), whose sum is σ = 1714406400. Its totient is φ = 1664807952.

The previous prime is 1689553531. The next prime is 1689553571. The reversal of 1689553561 is 1653559861.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1689553561 - 2¹³ = 1689545369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1689553531) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5215 + ... + 58363.

It is an arithmetic number, because the mean of its divisors is an integer number (214300800).

Almost surely, 2^1689553561 is an apocalyptic number.

It is an amenable number.

1689553561 is a deficient number, since it is larger than the sum of its proper divisors (24852839).

1689553561 is an equidigital number, since it uses as much as digits as its factorization.

1689553561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53615.

The product of its digits is 972000, while the sum is 49.

The square root of 1689553561 is about 41104.1793617145. The cubic root of 1689553561 is about 1191.0335302301.

The spelling of 1689553561 in words is "one billion, six hundred eighty-nine million, five hundred fifty-three thousand, five hundred sixty-one".