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11689561 = 1322632
BaseRepresentation
bin101100100101…
…111001011001
3210222220001201
4230211321121
510443031221
61054314201
7201234232
oct54457131
923886051
1011689561
1166645a4
123ab8961
132563900
1417a4089
15105d891
hexb25e59

11689561 has 9 divisors (see below), whose sum is σ = 12706239. Its totient is φ = 10749336.

The previous prime is 11689553. The next prime is 11689571. The reversal of 11689561 is 16598611.

The square root of 11689561 is 3419.

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

It can be written as a sum of positive squares in only one way, i.e., 1729225 + 9960336 = 1315^2 + 3156^2 .

It is not a de Polignac number, because 11689561 - 23 = 11689553 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 11689561.

It is not an unprimeable number, because it can be changed into a prime (11689501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 44316 + ... + 44578.

Almost surely, 211689561 is an apocalyptic number.

11689561 is the 3419-th square number.

11689561 is the 1710-th centered octagonal number.

It is an amenable number.

11689561 is a deficient number, since it is larger than the sum of its proper divisors (1016678).

11689561 is an frugal number, since it uses more digits than its factorization.

11689561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 552 (or 276 counting only the distinct ones).

The product of its digits is 12960, while the sum is 37.

The cubic root of 11689561 is about 226.9513308819.

The spelling of 11689561 in words is "eleven million, six hundred eighty-nine thousand, five hundred sixty-one".

Divisors: 1 13 169 263 3419 44447 69169 899197 11689561