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12431 = 31401

12431 has 4 divisors (see below), whose sum is σ = 12864. Its totient is φ = 12000.

The previous prime is 12421. The next prime is 12433. The reversal of 12431 is 13421.

Adding to 12431 its reverse (13421), we get a palindrome (25852).

Subtracting 12431 from its reverse (13421), we obtain a triangular number (990 = T44).

It can be divided in two parts, 124 and 31, that multiplied together give a square (3844 = 622).

It is a happy number.

12431 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-12431 is a prime.

It is a super-2 number, since 2×124312 = 309059522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 170 + ... + 231.

It is an arithmetic number, because the mean of its divisors is an integer number (3216).

212431 is an apocalyptic number.

12431 is a deficient number, since it is larger than the sum of its proper divisors (433).

12431 is an equidigital number, since it uses as much as digits as its factorization.

12431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 432.

The product of its digits is 24, while the sum is 11.

The square root of 12431 is about 111.4943944779. The cubic root of 12431 is about 23.1651627361.

The spelling of 12431 in words is "twelve thousand, four hundred thirty-one".

Divisors: 1 31 401 12431