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66491 is a prime number
BaseRepresentation
bin10000001110111011
310101012122
4100032323
54111431
61231455
7364565
oct201673
9111178
1066491
1145a57
123258b
1324359
141a335
1514a7b
hex103bb

66491 has 2 divisors, whose sum is σ = 66492. Its totient is φ = 66490.

The previous prime is 66467. The next prime is 66499. The reversal of 66491 is 19466.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-66491 is a prime.

It is a plaindrome in base 9.

It is a self number, because there is not a number n which added to its sum of digits gives 66491.

It is not a weakly prime, because it can be changed into another prime (66499) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33245 + 33246.

It is an arithmetic number, because the mean of its divisors is an integer number (33246).

266491 is an apocalyptic number.

66491 is a deficient number, since it is larger than the sum of its proper divisors (1).

66491 is an equidigital number, since it uses as much as digits as its factorization.

66491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1296, while the sum is 26.

The square root of 66491 is about 257.8584883226. The cubic root of 66491 is about 40.5123673047.

The spelling of 66491 in words is "sixty-six thousand, four hundred ninety-one".