280864117 has 2 divisors, whose sum is σ = 280864118. Its totient is φ = 280864116.

The previous prime is 280864079. The next prime is 280864121. The reversal of 280864117 is 711468082.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 280864081 + 36 = 16759^2 + 6^2 .

It is a cyclic number.

It is not a de Polignac number, because 280864117 - 2¹¹ = 280862069 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (280864187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140432058 + 140432059.

It is an arithmetic number, because the mean of its divisors is an integer number (140432059).

Almost surely, 2^280864117 is an apocalyptic number.

It is an amenable number.

280864117 is a deficient number, since it is larger than the sum of its proper divisors (1).

280864117 is an equidigital number, since it uses as much as digits as its factorization.

280864117 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21504, while the sum is 37.

The square root of 280864117 is about 16759.0010740497. The cubic root of 280864117 is about 654.8855670960.

The spelling of 280864117 in words is "two hundred eighty million, eight hundred sixty-four thousand, one hundred seventeen".