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135247 = 71392
BaseRepresentation
bin100001000001001111
320212112011
4201001033
513311442
62522051
71102210
oct410117
9225464
10135247
1192682
1266327
1349738
1437407
152a117
hex2104f

135247 has 6 divisors (see below), whose sum is σ = 155688. Its totient is φ = 115092.

The previous prime is 135241. The next prime is 135257. The reversal of 135247 is 742531.

It is not a de Polignac number, because 135247 - 27 = 135119 is a prime.

It is a Duffinian number.

135247 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 904 + ... + 1042.

It is an arithmetic number, because the mean of its divisors is an integer number (25948).

135247 is a Friedman number, since it can be written as 5^7+13^4*2, using all its digits and the basic arithmetic operations.

2135247 is an apocalyptic number.

135247 is a deficient number, since it is larger than the sum of its proper divisors (20441).

135247 is an frugal number, since it uses more digits than its factorization.

135247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 285 (or 146 counting only the distinct ones).

The product of its digits is 840, while the sum is 22.

The square root of 135247 is about 367.7594322380. The cubic root of 135247 is about 51.3305455655.

Adding to 135247 its reverse (742531), we get a palindrome (877778).

It can be divided in two parts, 13524 and 7, that added together give a palindrome (13531).

The spelling of 135247 in words is "one hundred thirty-five thousand, two hundred forty-seven".

Divisors: 1 7 139 973 19321 135247