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61015 = 512203
BaseRepresentation
bin1110111001010111
310002200211
432321113
53423030
61150251
7342613
oct167127
9102624
1061015
1141929
122b387
1321a06
1418343
151312a
hexee57

61015 has 4 divisors (see below), whose sum is σ = 73224. Its totient is φ = 48808.

The previous prime is 61007. The next prime is 61027. The reversal of 61015 is 51016.

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 61015 - 23 = 61007 is a prime.

It is a Smith number, since the sum of its digits (13) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

61015 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 60986 and 61004.

It is a congruent number.

It is an unprimeable number.

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, 6097 + ... + 6106.

It is an arithmetic number, because the mean of its divisors is an integer number (18306).

261015 is an apocalyptic number.

61015 is a deficient number, since it is larger than the sum of its proper divisors (12209).

61015 is a wasteful number, since it uses less digits than its factorization.

61015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12208.

The product of its (nonzero) digits is 30, while the sum is 13.

The square root of 61015 is about 247.0121454504. The cubic root of 61015 is about 39.3681982036.

Subtracting from 61015 its reverse (51016), we obtain a palindrome (9999).

It can be divided in two parts, 610 and 15, that added together give a 4-th power (625 = 54).

The spelling of 61015 in words is "sixty-one thousand, fifteen".

Divisors: 1 5 12203 61015