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228521117 = 1189233423
BaseRepresentation
bin11011001111011…
…11010010011101
3120221000002001002
431213233102131
5432000133432
634402000045
75443253216
oct1547572235
9527002032
10228521117
11107aa3330
1264646025
13384620c6
14224c840d
15150dee62
hexd9ef49d

228521117 has 8 divisors (see below), whose sum is σ = 252097920. Its totient is φ = 205411360.

The previous prime is 228521099. The next prime is 228521129. The reversal of 228521117 is 711125822.

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

It is not a de Polignac number, because 228521117 - 210 = 228520093 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 228521117.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (228521177) 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, 115733 + ... + 117690.

It is an arithmetic number, because the mean of its divisors is an integer number (31512240).

Almost surely, 2228521117 is an apocalyptic number.

It is an amenable number.

228521117 is a deficient number, since it is larger than the sum of its proper divisors (23576803).

228521117 is a wasteful number, since it uses less digits than its factorization.

228521117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 233523.

The product of its digits is 2240, while the sum is 29.

The square root of 228521117 is about 15116.9149299717. The cubic root of 228521117 is about 611.3765535476.

Adding to 228521117 its reverse (711125822), we get a palindrome (939646939).

The spelling of 228521117 in words is "two hundred twenty-eight million, five hundred twenty-one thousand, one hundred seventeen".

Divisors: 1 11 89 979 233423 2567653 20774647 228521117