289800265561 has 3 divisors (see below), whose sum is σ = 289800803893. Its totient is φ = 289799727230.

The previous prime is 289800265549. The next prime is 289800265571. The reversal of 289800265561 is 165562008982.

The square root of 289800265561 is 538331.

It is a perfect power (a square), and thus also a powerful number.

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 is not a de Polignac number, because 289800265561 - 2⁹ = 289800265049 is a prime.

It is a super-2 number, since 2×289800265561² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 289800265499 and 289800265508.

It is not an unprimeable number, because it can be changed into a prime (289800265541) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 269166 + ... + 807496.

Almost surely, 2^289800265561 is an apocalyptic number.

289800265561 is the 538331-st square number.

289800265561 is the 269166-th centered octagonal number.

It is an amenable number.

289800265561 is a deficient number, since it is larger than the sum of its proper divisors (538332).

289800265561 is an frugal number, since it uses more digits than its factorization.

289800265561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1076662 (or 538331 counting only the distinct ones).

The product of its (nonzero) digits is 2073600, while the sum is 52.

The spelling of 289800265561 in words is "two hundred eighty-nine billion, eight hundred million, two hundred sixty-five thousand, five hundred sixty-one".