Search a number
-
+
23931 = 322659
BaseRepresentation
bin101110101111011
31012211100
411311323
51231211
6302443
7126525
oct56573
935740
1023931
1116a86
1211a23
13ab7b
148a15
157156
hex5d7b

23931 has 6 divisors (see below), whose sum is σ = 34580. Its totient is φ = 15948.

The previous prime is 23929. The next prime is 23957. The reversal of 23931 is 13932.

Subtracting from 23931 its reverse (13932), we obtain a palindrome (9999).

It is not a de Polignac number, because 23931 - 21 = 23929 is a prime.

It is a super-2 number, since 2×239312 = 1145385522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1321 + ... + 1338.

223931 is an apocalyptic number.

23931 is a deficient number, since it is larger than the sum of its proper divisors (10649).

23931 is a wasteful number, since it uses less digits than its factorization.

23931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2665 (or 2662 counting only the distinct ones).

The product of its digits is 162, while the sum is 18.

The square root of 23931 is about 154.6964770122. The cubic root of 23931 is about 28.8173217557.

The spelling of 23931 in words is "twenty-three thousand, nine hundred thirty-one".

Divisors: 1 3 9 2659 7977 23931