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231132309 = 31034991499
BaseRepresentation
bin11011100011011…
…00110010010101
3121002220201220220
431301230302111
5433132213214
634533544553
75504410062
oct1561546225
9532821826
10231132309
11109517141
12654a5159
1338b677a5
14229a7c69
15154589a9
hexdc6cc95

231132309 has 16 divisors (see below), whose sum is σ = 312000000. Its totient is φ = 152184816.

The previous prime is 231132299. The next prime is 231132337. The reversal of 231132309 is 903231132.

It is not a de Polignac number, because 231132309 - 25 = 231132277 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231132389) 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, 153442 + ... + 154940.

It is an arithmetic number, because the mean of its divisors is an integer number (19500000).

Almost surely, 2231132309 is an apocalyptic number.

It is an amenable number.

231132309 is a deficient number, since it is larger than the sum of its proper divisors (80867691).

231132309 is a wasteful number, since it uses less digits than its factorization.

231132309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2104.

The product of its (nonzero) digits is 972, while the sum is 24.

The square root of 231132309 is about 15203.0361770273. The cubic root of 231132309 is about 613.6963674318.

The spelling of 231132309 in words is "two hundred thirty-one million, one hundred thirty-two thousand, three hundred nine".

Divisors: 1 3 103 309 499 1497 1499 4497 51397 154191 154397 463191 748001 2244003 77044103 231132309