Search a number
-
+
228145181 = 1189397587
BaseRepresentation
bin11011001100100…
…11100000011101
3120220021222100112
431212103200131
5431401121211
634345535405
75440126205
oct1546234035
9526258315
10228145181
11107866940
12644a4565
133835cc64
142242b405
151506888b
hexd99381d

228145181 has 16 divisors (see below), whose sum is σ = 252745920. Its totient is φ = 204209280.

The previous prime is 228145123. The next prime is 228145187. The reversal of 228145181 is 181541822.

228145181 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a de Polignac number, because none of the positive numbers 2k-228145181 is a prime.

It is a super-2 number, since 2×2281451812 = 104100447227045522, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (228145187) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 388370 + ... + 388956.

It is an arithmetic number, because the mean of its divisors is an integer number (15796620).

Almost surely, 2228145181 is an apocalyptic number.

It is an amenable number.

228145181 is a deficient number, since it is larger than the sum of its proper divisors (24600739).

228145181 is a wasteful number, since it uses less digits than its factorization.

228145181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1084.

The product of its digits is 5120, while the sum is 32.

The square root of 228145181 is about 15104.4755287961. The cubic root of 228145181 is about 611.0411146631.

The spelling of 228145181 in words is "two hundred twenty-eight million, one hundred forty-five thousand, one hundred eighty-one".

Divisors: 1 11 89 397 587 979 4367 6457 35333 52243 233039 388663 574673 2563429 20740471 228145181