Search a number
-
+
661697 is a prime number
BaseRepresentation
bin10100001100011000001
31020121200022
42201203001
5132133242
622103225
75424101
oct2414301
91217608
10661697
11412163
1227ab15
131a224a
14133201
15d10d2
hexa18c1

661697 has 2 divisors, whose sum is σ = 661698. Its totient is φ = 661696.

The previous prime is 661679. The next prime is 661721. The reversal of 661697 is 796166.

It is a happy number.

Together with previous prime (661679) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 430336 + 231361 = 656^2 + 481^2 .

It is a cyclic number.

It is not a de Polignac number, because 661697 - 214 = 645313 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (661607) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330848 + 330849.

It is an arithmetic number, because the mean of its divisors is an integer number (330849).

2661697 is an apocalyptic number.

It is an amenable number.

661697 is a deficient number, since it is larger than the sum of its proper divisors (1).

661697 is an equidigital number, since it uses as much as digits as its factorization.

661697 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13608, while the sum is 35.

The square root of 661697 is about 813.4476012627. The cubic root of 661697 is about 87.1404346596.

The spelling of 661697 in words is "six hundred sixty-one thousand, six hundred ninety-seven".