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15145 = 513233
BaseRepresentation
bin11101100101001
3202202221
43230221
5441040
6154041
762104
oct35451
922687
1015145
1110419
128921
136b80
14573b
15474a
hex3b29

15145 has 8 divisors (see below), whose sum is σ = 19656. Its totient is φ = 11136.

The previous prime is 15139. The next prime is 15149. The reversal of 15145 is 54151.

15145 = T6 + T7 + ... + T44.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 16 + 15129 = 4^2 + 123^2 .

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 15145 - 23 = 15137 is a prime.

It is not an unprimeable number, because it can be changed into a prime (15149) 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, 52 + ... + 181.

It is an arithmetic number, because the mean of its divisors is an integer number (2457).

215145 is an apocalyptic number.

It is an amenable number.

15145 is a deficient number, since it is larger than the sum of its proper divisors (4511).

15145 is a wasteful number, since it uses less digits than its factorization.

15145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 251.

The product of its digits is 100, while the sum is 16.

The square root of 15145 is about 123.0650234632. The cubic root of 15145 is about 24.7413328834.

Subtracting from 15145 its sum of digits (16), we obtain a square (15129 = 1232).

Adding to 15145 its reverse (54151), we get a palindrome (69296).

It can be divided in two parts, 151 and 45, that added together give a square (196 = 142).

The spelling of 15145 in words is "fifteen thousand, one hundred forty-five".

Divisors: 1 5 13 65 233 1165 3029 15145