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131668 = 2232917
BaseRepresentation
bin100000001001010100
320200121121
4200021110
513203133
62453324
71055605
oct401124
9220547
10131668
118aa19
1264244
1347c14
1435dac
152902d
hex20254

131668 has 6 divisors (see below), whose sum is σ = 230426. Its totient is φ = 65832.

The previous prime is 131641. The next prime is 131671. The reversal of 131668 is 866131.

It can be written as a sum of positive squares in only one way, i.e., 114244 + 17424 = 338^2 + 132^2 .

It is a congruent number.

It is an unprimeable number.

131668 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16455 + ... + 16462.

2131668 is an apocalyptic number.

It is an amenable number.

131668 is a deficient number, since it is larger than the sum of its proper divisors (98758).

131668 is a wasteful number, since it uses less digits than its factorization.

131668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32921 (or 32919 counting only the distinct ones).

The product of its digits is 864, while the sum is 25.

The square root of 131668 is about 362.8608548742. The cubic root of 131668 is about 50.8737103429.

Adding to 131668 its reverse (866131), we get a palindrome (997799).

It can be divided in two parts, 13 and 1668, that added together give a square (1681 = 412).

The spelling of 131668 in words is "one hundred thirty-one thousand, six hundred sixty-eight".

Divisors: 1 2 4 32917 65834 131668