647161 has 2 divisors, whose sum is σ = 647162. Its totient is φ = 647160.

The previous prime is 647147. The next prime is 647189. The reversal of 647161 is 161746.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 571536 + 75625 = 756^2 + 275^2 .

It is a cyclic number.

It is not a de Polignac number, because 647161 - 2⁷ = 647033 is a prime.

It is a plaindrome in base 14.

It is a nialpdrome in base 15.

It is not a weakly prime, because it can be changed into another prime (647111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323580 + 323581.

It is an arithmetic number, because the mean of its divisors is an integer number (323581).

2⁶⁴⁷¹⁶¹ is an apocalyptic number.

It is an amenable number.

647161 is a deficient number, since it is larger than the sum of its proper divisors (1).

647161 is an equidigital number, since it uses as much as digits as its factorization.

647161 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 647161 is about 804.4631750428. The cubic root of 647161 is about 86.4976109467.

It can be divided in two parts, 647 and 161, that added together give a palindrome (808).

The spelling of 647161 in words is "six hundred forty-seven thousand, one hundred sixty-one".