Search a number
-
+
36581 = 157233
BaseRepresentation
bin1000111011100101
31212011212
420323211
52132311
6441205
7211436
oct107345
955155
1036581
1125536
1219205
131385c
14d48d
15ac8b
hex8ee5

36581 has 4 divisors (see below), whose sum is σ = 36972. Its totient is φ = 36192.

The previous prime is 36571. The next prime is 36583. The reversal of 36581 is 18563.

36581 is nontrivially palindromic in base 9.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 18563 = 19977.

It can be written as a sum of positive squares in 2 ways, for example, as 9025 + 27556 = 95^2 + 166^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-36581 is a prime.

It is a super-2 number, since 2×365812 = 2676339122, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 36581.

It is not an unprimeable number, because it can be changed into a prime (36583) 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, 41 + ... + 273.

It is an arithmetic number, because the mean of its divisors is an integer number (9243).

236581 is an apocalyptic number.

It is an amenable number.

36581 is a deficient number, since it is larger than the sum of its proper divisors (391).

36581 is a wasteful number, since it uses less digits than its factorization.

36581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 390.

The product of its digits is 720, while the sum is 23.

The square root of 36581 is about 191.2616009553. The cubic root of 36581 is about 33.1959568309.

The spelling of 36581 in words is "thirty-six thousand, five hundred eighty-one".

Divisors: 1 157 233 36581