1280161 has 2 divisors, whose sum is σ = 1280162. Its totient is φ = 1280160.

The previous prime is 1280159. The next prime is 1280173. The reversal of 1280161 is 1610821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 844561 + 435600 = 919^2 + 660^2 .

It is a cyclic number.

It is not a de Polignac number, because 1280161 - 2¹ = 1280159 is a prime.

Together with 1280159, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1280101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 640080 + 640081.

It is an arithmetic number, because the mean of its divisors is an integer number (640081).

2^1280161 is an apocalyptic number.

It is an amenable number.

1280161 is a deficient number, since it is larger than the sum of its proper divisors (1).

1280161 is an equidigital number, since it uses as much as digits as its factorization.

1280161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96, while the sum is 19.

The square root of 1280161 is about 1131.4420002811. The cubic root of 1280161 is about 108.5812567775.

Adding to 1280161 its reverse (1610821), we get a palindrome (2890982).

It can be divided in two parts, 1280 and 161, that added together give a palindrome (1441).

The spelling of 1280161 in words is "one million, two hundred eighty thousand, one hundred sixty-one".