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61885 = 512377
BaseRepresentation
bin1111000110111101
310010220001
433012331
53440020
61154301
7345265
oct170675
9103801
1061885
114254a
122b991
1322225
14187a5
151350a
hexf1bd

61885 has 4 divisors (see below), whose sum is σ = 74268. Its totient is φ = 49504.

The previous prime is 61879. The next prime is 61909. The reversal of 61885 is 58816.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 13924 + 47961 = 118^2 + 219^2 .

It is a cyclic number.

It is not a de Polignac number, because 61885 - 27 = 61757 is a prime.

It is a Duffinian number.

It is a plaindrome in base 13.

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, 6184 + ... + 6193.

It is an arithmetic number, because the mean of its divisors is an integer number (18567).

261885 is an apocalyptic number.

It is an amenable number.

61885 is a deficient number, since it is larger than the sum of its proper divisors (12383).

61885 is a wasteful number, since it uses less digits than its factorization.

61885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12382.

The product of its digits is 1920, while the sum is 28.

The square root of 61885 is about 248.7669592209. The cubic root of 61885 is about 39.5544301162.

It can be divided in two parts, 618 and 85, that added together give a triangular number (703 = T37).

The spelling of 61885 in words is "sixty-one thousand, eight hundred eighty-five".

Divisors: 1 5 12377 61885