Search a number
68131 = 79733
BaseRepresentation
bin10000101000100011
310110110101
4100220203
54140011
61243231
7402430
oct205043
9113411
1068131
1147208
1233517
132501b
141ab87
15152c1
hex10a23

68131 has 4 divisors (see below), whose sum is σ = 77872. Its totient is φ = 58392.

The previous prime is 68113. The next prime is 68141. The reversal of 68131 is 13186.

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 68131 - 25 = 68099 is a prime.

It is a super-2 number, since 2×681312 = 9283666322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 68099 and 68108.

It is not an unprimeable number, because it can be changed into a prime (68111) 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, 4860 + ... + 4873.

It is an arithmetic number, because the mean of its divisors is an integer number (19468).

268131 is an apocalyptic number.

68131 is a deficient number, since it is larger than the sum of its proper divisors (9741).

68131 is an equidigital number, since it uses as much as digits as its factorization.

68131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9740.

The product of its digits is 144, while the sum is 19.

The square root of 68131 is about 261.0191563851. The cubic root of 68131 is about 40.8427448342.

Subtracting from 68131 its reverse (13186), we obtain a palindrome (54945).

The spelling of 68131 in words is "sixty-eight thousand, one hundred thirty-one".

Divisors: 1 7 9733 68131