Search a number
-
+
105631 = 731447
BaseRepresentation
bin11001110010011111
312100220021
4121302133
511340011
62133011
7616651
oct316237
9170807
10105631
11723a9
1251167
1339106
142a6d1
1521471
hex19c9f

105631 has 4 divisors (see below), whose sum is σ = 107152. Its totient is φ = 104112.

The previous prime is 105619. The next prime is 105649. The reversal of 105631 is 136501.

105631 = T13 + T14 + ... + T85.

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 105631 - 27 = 105503 is a prime.

It is a super-2 number, since 2×1056312 = 22315816322, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (105601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 651 + ... + 796.

It is an arithmetic number, because the mean of its divisors is an integer number (26788).

2105631 is an apocalyptic number.

105631 is a deficient number, since it is larger than the sum of its proper divisors (1521).

105631 is an equidigital number, since it uses as much as digits as its factorization.

105631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1520.

The product of its (nonzero) digits is 90, while the sum is 16.

The square root of 105631 is about 325.0092306381. The cubic root of 105631 is about 47.2712547730.

The spelling of 105631 in words is "one hundred five thousand, six hundred thirty-one".

Divisors: 1 73 1447 105631