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BaseRepresentation
bin10111011111111
3121111121
42323333
5341111
6131411
750035
oct27377
917447
1012031
119048
126b67
135626
144555
153871
hex2eff

12031 has 4 divisors (see below), whose sum is σ = 12312. Its totient is φ = 11752.

The previous prime is 12011. The next prime is 12037. The reversal of 12031 is 13021.

Adding to 12031 its reverse (13021), we get a palindrome (25052).

Subtracting 12031 from its reverse (13021), we obtain a triangular number (990 = T44).

It can be divided in two parts, 120 and 31, that added together give a palindrome (151).

12031 is nontrivially palindromic in base 3.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13021 = 29449.

It is a cyclic number.

It is not a de Polignac number, because 12031 - 27 = 11903 is a prime.

It is a super-2 number, since 2×120312 = 289489922, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 14 and base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12037) 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, 61 + ... + 166.

It is an arithmetic number, because the mean of its divisors is an integer number (3078).

212031 is an apocalyptic number.

12031 is a deficient number, since it is larger than the sum of its proper divisors (281).

12031 is an equidigital number, since it uses as much as digits as its factorization.

12031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 280.

The product of its (nonzero) digits is 6, while the sum is 7.

The square root of 12031 is about 109.6859152307. The cubic root of 12031 is about 22.9139824221.

The spelling of 12031 in words is "twelve thousand, thirty-one".

Divisors: 1 53 227 12031