1647161 has 2 divisors, whose sum is σ = 1647162. Its totient is φ = 1647160.

The previous prime is 1647137. The next prime is 1647179. The reversal of 1647161 is 1617461.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1537600 + 109561 = 1240^2 + 331^2 .

It is a cyclic number.

It is not a de Polignac number, because 1647161 - 2⁶ = 1647097 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1647161.

It is not a weakly prime, because it can be changed into another prime (1647101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 823580 + 823581.

It is an arithmetic number, because the mean of its divisors is an integer number (823581).

2^1647161 is an apocalyptic number.

It is an amenable number.

1647161 is a deficient number, since it is larger than the sum of its proper divisors (1).

1647161 is an equidigital number, since it uses as much as digits as its factorization.

1647161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1008, while the sum is 26.

The square root of 1647161 is about 1283.4177028544. The cubic root of 1647161 is about 118.0987634311.

The spelling of 1647161 in words is "one million, six hundred forty-seven thousand, one hundred sixty-one".