280864161 has 6 divisors (see below), whose sum is σ = 405692690. Its totient is φ = 187242768.

The previous prime is 280864121. The next prime is 280864187. The reversal of 280864161 is 161468082.

280864161 is a `hidden beast` number, since 2 + 8 + 0 + 8 + 641 + 6 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 187142400 + 93721761 = 13680^2 + 9681^2 .

It is not a de Polignac number, because 280864161 - 2¹³ = 280855969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (280864121) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 15603556 + ... + 15603573.

Almost surely, 2^280864161 is an apocalyptic number.

It is an amenable number.

280864161 is a deficient number, since it is larger than the sum of its proper divisors (124828529).

280864161 is a wasteful number, since it uses less digits than its factorization.

280864161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31207135 (or 31207132 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 36.

The square root of 280864161 is about 16759.0023867771. The cubic root of 280864161 is about 654.8856012940.

The spelling of 280864161 in words is "two hundred eighty million, eight hundred sixty-four thousand, one hundred sixty-one".