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231123313 = 1713595489
BaseRepresentation
bin11011100011010…
…10100101110001
3121002220021120201
431301222211301
5433131421223
634533435201
75504341621
oct1561524561
9532807521
10231123313
11109510403
126549bb01
1338b63675
14229a4881
1515455ead
hexdc6a971

231123313 has 4 divisors (see below), whose sum is σ = 244718820. Its totient is φ = 217527808.

The previous prime is 231123271. The next prime is 231123337. The reversal of 231123313 is 313321132.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 80496784 + 150626529 = 8972^2 + 12273^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-231123313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231123413) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6797728 + ... + 6797761.

It is an arithmetic number, because the mean of its divisors is an integer number (61179705).

Almost surely, 2231123313 is an apocalyptic number.

It is an amenable number.

231123313 is a deficient number, since it is larger than the sum of its proper divisors (13595507).

231123313 is a wasteful number, since it uses less digits than its factorization.

231123313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13595506.

The product of its digits is 324, while the sum is 19.

The square root of 231123313 is about 15202.7403121937. The cubic root of 231123313 is about 613.6884053484.

Adding to 231123313 its reverse (313321132), we get a palindrome (544444445).

The spelling of 231123313 in words is "two hundred thirty-one million, one hundred twenty-three thousand, three hundred thirteen".

Divisors: 1 17 13595489 231123313