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23231 = 131787
BaseRepresentation
bin101101010111111
31011212102
411222333
51220411
6255315
7124505
oct55277
934772
1023231
11164aa
121153b
13a760
148675
156d3b
hex5abf

23231 has 4 divisors (see below), whose sum is σ = 25032. Its totient is φ = 21432.

The previous prime is 23227. The next prime is 23251. The reversal of 23231 is 13232.

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

It is a cyclic number.

It is not a de Polignac number, because 23231 - 22 = 23227 is a prime.

It is a super-2 number, since 2×232312 = 1079358722, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 4 and base 16.

It is a nialpdrome in base 13.

It is a zygodrome in base 4.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23201) 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 3 ways as a sum of consecutive naturals, for example, 881 + ... + 906.

It is an arithmetic number, because the mean of its divisors is an integer number (6258).

223231 is an apocalyptic number.

23231 is a deficient number, since it is larger than the sum of its proper divisors (1801).

23231 is a wasteful number, since it uses less digits than its factorization.

23231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1800.

The product of its digits is 36, while the sum is 11.

The square root of 23231 is about 152.4171906315. The cubic root of 23231 is about 28.5335605469.

Subtracting from 23231 its sum of digits (11), we obtain a triangular number (23220 = T215).

Adding to 23231 its reverse (13232), we get a palindrome (36463).

Subtracting from 23231 its reverse (13232), we obtain a palindrome (9999).

The spelling of 23231 in words is "twenty-three thousand, two hundred thirty-one".

Divisors: 1 13 1787 23231