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12131 = 71733
BaseRepresentation
bin10111101100011
3121122022
42331203
5342011
6132055
750240
oct27543
917568
1012131
119129
12702b
1356a2
1445c7
1538db
hex2f63

12131 has 4 divisors (see below), whose sum is σ = 13872. Its totient is φ = 10392.

The previous prime is 12119. The next prime is 12143. The reversal of 12131 is 13121.

Adding to 12131 its reverse (13121), we get a palindrome (25252).

Subtracting 12131 from its reverse (13121), we obtain a triangular number (990 = T44).

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

It is an interprime number because it is at equal distance from previous prime (12119) and next prime (12143).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-12131 is a prime.

It is a super-2 number, since 2×121312 = 294322322, which contains 22 as substring.

It is a house number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12101) 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, 860 + ... + 873.

It is an arithmetic number, because the mean of its divisors is an integer number (3468).

212131 is an apocalyptic number.

12131 is a deficient number, since it is larger than the sum of its proper divisors (1741).

12131 is an equidigital number, since it uses as much as digits as its factorization.

12131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1740.

The product of its digits is 6, while the sum is 8.

The square root of 12131 is about 110.1408189546. The cubic root of 12131 is about 22.9772932802.

The spelling of 12131 in words is "twelve thousand, one hundred thirty-one".

Divisors: 1 7 1733 12131