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281065225 = 52724792
BaseRepresentation
bin10000110000001…
…011011100001001
3201120212121000011
4100300023130021
51033423041400
643520111521
76652005100
oct2060133411
9646777004
10281065225
11134721511
127a1655a1
13462cb4ac
1429485037
1519a1d8ba
hex10c0b709

281065225 has 27 divisors (see below), whose sum is σ = 406270407. Its totient is φ = 192328080.

The previous prime is 281065193. The next prime is 281065241. The reversal of 281065225 is 522560182.

The square root of 281065225 is 16765.

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., 101183481 + 179881744 = 10059^2 + 13412^2 .

It is not a de Polignac number, because 281065225 - 25 = 281065193 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 586536 + ... + 587014.

Almost surely, 2281065225 is an apocalyptic number.

281065225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

281065225 is the 16765-th square number.

281065225 is the 8383-rd centered octagonal number.

It is an amenable number.

281065225 is a deficient number, since it is larger than the sum of its proper divisors (125205182).

281065225 is an frugal number, since it uses more digits than its factorization.

281065225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 982 (or 491 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 31.

The cubic root of 281065225 is about 655.0418363814.

The spelling of 281065225 in words is "two hundred eighty-one million, sixty-five thousand, two hundred twenty-five".