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63781 is a prime number
BaseRepresentation
bin1111100100100101
310020111021
433210211
54020111
61211141
7353644
oct174445
9106437
1063781
1143a13
1230ab1
1323053
141935b
1513d71
hexf925

63781 has 2 divisors, whose sum is σ = 63782. Its totient is φ = 63780.

The previous prime is 63773. The next prime is 63793. The reversal of 63781 is 18736.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 54756 + 9025 = 234^2 + 95^2 .

It is a cyclic number.

It is not a de Polignac number, because 63781 - 23 = 63773 is a prime.

It is a super-2 number, since 2×637812 = 8136031922, which contains 22 as substring.

63781 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (63761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31890 + 31891.

It is an arithmetic number, because the mean of its divisors is an integer number (31891).

263781 is an apocalyptic number.

It is an amenable number.

63781 is a deficient number, since it is larger than the sum of its proper divisors (1).

63781 is an equidigital number, since it uses as much as digits as its factorization.

63781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1008, while the sum is 25.

The square root of 63781 is about 252.5490051455. The cubic root of 63781 is about 39.9543228598.

The spelling of 63781 in words is "sixty-three thousand, seven hundred eighty-one".