280997 has 2 divisors, whose sum is σ = 280998. Its totient is φ = 280996.

The previous prime is 280979. The next prime is 281023. The reversal of 280997 is 799082.

Together with previous prime (280979) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 279841 + 1156 = 529^2 + 34^2 .

It is a cyclic number.

It is not a de Polignac number, because 280997 - 2⁶ = 280933 is a prime.

It is a Chen prime.

It is an Ulam number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 280997.

It is not a weakly prime, because it can be changed into another prime (280927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140498 + 140499.

It is an arithmetic number, because the mean of its divisors is an integer number (140499).

2²⁸⁰⁹⁹⁷ is an apocalyptic number.

It is an amenable number.

280997 is a deficient number, since it is larger than the sum of its proper divisors (1).

280997 is an equidigital number, since it uses as much as digits as its factorization.

280997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9072, while the sum is 35.

The square root of 280997 is about 530.0915015353. The cubic root of 280997 is about 65.4988831074.

The spelling of 280997 in words is "two hundred eighty thousand, nine hundred ninety-seven".