280161 has 12 divisors (see below), whose sum is σ = 462592. Its totient is φ = 160056.

The previous prime is 280139. The next prime is 280183. The reversal of 280161 is 161082.

It is an interprime number because it is at equal distance from previous prime (280139) and next prime (280183).

It is not a de Polignac number, because 280161 - 2⁵ = 280129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (280121) 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 in 11 ways as a sum of consecutive naturals, for example, 2161 + ... + 2286.

2²⁸⁰¹⁶¹ is an apocalyptic number.

280161 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

280161 is a deficient number, since it is larger than the sum of its proper divisors (182431).

280161 is a wasteful number, since it uses less digits than its factorization.

280161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4460 (or 4457 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

The square root of 280161 is about 529.3023710508. The cubic root of 280161 is about 65.4338628887.

It can be divided in two parts, 280 and 161, that added together give a square (441 = 21²).

The spelling of 280161 in words is "two hundred eighty thousand, one hundred sixty-one".