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51866 = 225933
BaseRepresentation
bin1100101010011010
32122010222
430222122
53124431
61040042
7304133
oct145232
978128
1051866
1135a71
1226022
131a7b9
1414c8a
151057b
hexca9a

51866 has 4 divisors (see below), whose sum is σ = 77802. Its totient is φ = 25932.

The previous prime is 51859. The next prime is 51869. The reversal of 51866 is 66815.

51866 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in only one way, i.e., 48841 + 3025 = 221^2 + 55^2 .

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (51869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12965 + ... + 12968.

251866 is an apocalyptic number.

51866 is a deficient number, since it is larger than the sum of its proper divisors (25936).

51866 is a wasteful number, since it uses less digits than its factorization.

51866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25935.

The product of its digits is 1440, while the sum is 26.

The square root of 51866 is about 227.7410810548. The cubic root of 51866 is about 37.2930226750.

The spelling of 51866 in words is "fifty-one thousand, eight hundred sixty-six".

Divisors: 1 2 25933 51866