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47561 = 199239
BaseRepresentation
bin1011100111001001
32102020112
423213021
53010221
61004105
7255443
oct134711
972215
1047561
1132808
1223635
1318857
1413493
15e15b
hexb9c9

47561 has 4 divisors (see below), whose sum is σ = 48000. Its totient is φ = 47124.

The previous prime is 47543. The next prime is 47563. The reversal of 47561 is 16574.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 16574 = 28287.

It is a cyclic number.

It is not a de Polignac number, because 47561 - 26 = 47497 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (47563) 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, 80 + ... + 318.

It is an arithmetic number, because the mean of its divisors is an integer number (12000).

247561 is an apocalyptic number.

It is an amenable number.

47561 is a deficient number, since it is larger than the sum of its proper divisors (439).

47561 is a wasteful number, since it uses less digits than its factorization.

47561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 438.

The product of its digits is 840, while the sum is 23.

The square root of 47561 is about 218.0848458743. The cubic root of 47561 is about 36.2312784819.

The spelling of 47561 in words is "forty-seven thousand, five hundred sixty-one".

Divisors: 1 199 239 47561