Search a number
-
+
215233605 = 3165
BaseRepresentation
bin11001101010000…
…11010001000101
3120000000000000000
430311003101011
5420044433410
633205111513
75222312136
oct1465032105
9500000000
10215233605
11100548214
12600b8599
133578c082
1420829c8d
1513d67dc0
hexcd43445

215233605 has 34 divisors (see below), whose sum is σ = 387420486. Its totient is φ = 114791256.

The previous prime is 215233573. The next prime is 215233607. The reversal of 215233605 is 506332512.

215233605 is a `hidden beast` number, since 2 + 1 + 52 + 3 + 3 + 605 = 666.

It can be written as a sum of positive squares in only one way, i.e., 172186884 + 43046721 = 13122^2 + 6561^2 .

It is an ABA number since it can be written as A⋅BA, here for A=15, B=3.

It is not a de Polignac number, because 215233605 - 25 = 215233573 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a nialpdrome in base 9.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215233607) by changing a digit.

It is a polite number, since it can be written in 33 ways as a sum of consecutive naturals, for example, 43046719 + ... + 43046723.

Almost surely, 2215233605 is an apocalyptic number.

It is an amenable number.

215233605 is a deficient number, since it is larger than the sum of its proper divisors (172186881).

215233605 is an frugal number, since it uses more digits than its factorization.

215233605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53 (or 8 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 27.

The square root of 215233605 is about 14670.8420003761. The cubic root of 215233605 is about 599.2895340623.

The spelling of 215233605 in words is "two hundred fifteen million, two hundred thirty-three thousand, six hundred five".

Divisors: 1 3 5 9 15 27 45 81 135 243 405 729 1215 2187 3645 6561 10935 19683 32805 59049 98415 177147 295245 531441 885735 1594323 2657205 4782969 7971615 14348907 23914845 43046721 71744535 215233605