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228161055 = 3537411101
BaseRepresentation
bin11011001100101…
…11011000011111
3120220022210010110
431212113120133
5431402123210
634350141103
75440223403
oct1546273037
9526283113
10228161055
11107877861
12644b1793
1338367255
1422433103
151506d420
hexd99761f

228161055 has 16 divisors (see below), whose sum is σ = 374925024. Its totient is φ = 118396800.

The previous prime is 228161051. The next prime is 228161071. The reversal of 228161055 is 550161822.

It is not a de Polignac number, because 228161055 - 22 = 228161051 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (228161051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 204996 + ... + 206105.

It is an arithmetic number, because the mean of its divisors is an integer number (23432814).

Almost surely, 2228161055 is an apocalyptic number.

228161055 is a deficient number, since it is larger than the sum of its proper divisors (146763969).

228161055 is a wasteful number, since it uses less digits than its factorization.

228161055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 411146.

The product of its (nonzero) digits is 4800, while the sum is 30.

The square root of 228161055 is about 15105.0009930486. Note that the first 3 decimals coincide. The cubic root of 228161055 is about 611.0552861096.

Subtracting from 228161055 its sum of digits (30), we obtain a square (228161025 = 151052).

It can be divided in two parts, 22816 and 1055, that added together give a triangular number (23871 = T218).

The spelling of 228161055 in words is "two hundred twenty-eight million, one hundred sixty-one thousand, fifty-five".

Divisors: 1 3 5 15 37 111 185 555 411101 1233303 2055505 6166515 15210737 45632211 76053685 228161055