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211123135 = 5616311097
BaseRepresentation
bin11001001010101…
…11101110111111
3112201021011111101
430211113232333
5413021420020
632541033531
75142342226
oct1445275677
9481234441
10211123135
11a919aa33
125a8558a7
1334980142
1420079cbd
151380500a
hexc957bbf

211123135 has 16 divisors (see below), whose sum is σ = 258144192. Its totient is φ = 165715200.

The previous prime is 211123123. The next prime is 211123139. The reversal of 211123135 is 531321112.

It is not a de Polignac number, because 211123135 - 221 = 209025983 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211123139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 191907 + ... + 193003.

It is an arithmetic number, because the mean of its divisors is an integer number (16134012).

Almost surely, 2211123135 is an apocalyptic number.

211123135 is a deficient number, since it is larger than the sum of its proper divisors (47021057).

211123135 is a wasteful number, since it uses less digits than its factorization.

211123135 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1794.

The product of its digits is 180, while the sum is 19.

The square root of 211123135 is about 14530.0769096382. The cubic root of 211123135 is about 595.4499668100.

Adding to 211123135 its reverse (531321112), we get a palindrome (742444247).

The spelling of 211123135 in words is "two hundred eleven million, one hundred twenty-three thousand, one hundred thirty-five".

Divisors: 1 5 61 305 631 1097 3155 5485 38491 66917 192455 334585 692207 3461035 42224627 211123135