280913 has 2 divisors, whose sum is σ = 280914. Its totient is φ = 280912.

The previous prime is 280909. The next prime is 280921. The reversal of 280913 is 319082.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 262144 + 18769 = 512^2 + 137^2 .

It is a cyclic number.

It is not a de Polignac number, because 280913 - 2² = 280909 is a prime.

It is a super-2 number, since 2×280913² = 157824227138, which contains 22 as substring.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 280913.

It is not a weakly prime, because it can be changed into another prime (280933) 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 as a sum of consecutive naturals, namely, 140456 + 140457.

It is an arithmetic number, because the mean of its divisors is an integer number (140457).

2²⁸⁰⁹¹³ is an apocalyptic number.

It is an amenable number.

280913 is a deficient number, since it is larger than the sum of its proper divisors (1).

280913 is an equidigital number, since it uses as much as digits as its factorization.

280913 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 280913 is about 530.0122640091. The cubic root of 280913 is about 65.4923558082.

Adding to 280913 its reverse (319082), we get a palindrome (599995).

The spelling of 280913 in words is "two hundred eighty thousand, nine hundred thirteen".