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289102009 = 743472
BaseRepresentation
bin10001001110110…
…101100010111001
3202010222220101211
4101032311202321
51043002231014
644404243121
710110220000
oct2116654271
9663886354
10289102009
11139210689
12809a04a1
1347b835a1
142a577c37
151a5a9cc4
hex113b58b9

289102009 has 15 divisors (see below), whose sum is σ = 338240357. Its totient is φ = 247087596.

The previous prime is 289102007. The next prime is 289102027. The reversal of 289102009 is 900201982.

The square root of 289102009 is 17003.

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

It is not a de Polignac number, because 289102009 - 21 = 289102007 is a prime.

It is not an unprimeable number, because it can be changed into a prime (289102003) by changing a digit.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 832974 + ... + 833320.

Almost surely, 2289102009 is an apocalyptic number.

289102009 is the 17003-rd square number.

289102009 is the 8502-nd centered octagonal number.

It is an amenable number.

289102009 is a deficient number, since it is larger than the sum of its proper divisors (49138348).

289102009 is an frugal number, since it uses more digits than its factorization.

289102009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 722 (or 354 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 31.

The cubic root of 289102009 is about 661.2266817820.

The spelling of 289102009 in words is "two hundred eighty-nine million, one hundred two thousand, nine".

Divisors: 1 7 49 343 347 2401 2429 17003 119021 120409 833147 842863 5900041 41300287 289102009