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68561 = 1737109
BaseRepresentation
bin10000101111010001
310111001022
4100233101
54143221
61245225
7403613
oct205721
9114038
1068561
1147569
1233815
132528c
141adb3
15154ab
hex10bd1

68561 has 8 divisors (see below), whose sum is σ = 75240. Its totient is φ = 62208.

The previous prime is 68543. The next prime is 68567. The reversal of 68561 is 16586.

It can be written as a sum of positive squares in 4 ways, for example, as 40000 + 28561 = 200^2 + 169^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 68561 - 210 = 67537 is a prime.

It is a super-2 number, since 2×685612 = 9401221442, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 68561.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68567) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 575 + ... + 683.

It is an arithmetic number, because the mean of its divisors is an integer number (9405).

268561 is an apocalyptic number.

It is an amenable number.

68561 is a deficient number, since it is larger than the sum of its proper divisors (6679).

68561 is a wasteful number, since it uses less digits than its factorization.

68561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163.

The product of its digits is 1440, while the sum is 26.

The square root of 68561 is about 261.8415551436. The cubic root of 68561 is about 40.9284892663.

The spelling of 68561 in words is "sixty-eight thousand, five hundred sixty-one".

Divisors: 1 17 37 109 629 1853 4033 68561