280513 has 2 divisors, whose sum is σ = 280514. Its totient is φ = 280512.

The previous prime is 280507. The next prime is 280537. The reversal of 280513 is 315082.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 142129 + 138384 = 377^2 + 372^2 .

It is a cyclic number.

It is not a de Polignac number, because 280513 - 2⁹ = 280001 is a prime.

It is an Ulam number.

It is equal to p₂₄₄₇₂ and since 280513 and 24472 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (280583) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140256 + 140257.

It is an arithmetic number, because the mean of its divisors is an integer number (140257).

2²⁸⁰⁵¹³ is an apocalyptic number.

It is an amenable number.

280513 is a deficient number, since it is larger than the sum of its proper divisors (1).

280513 is an equidigital number, since it uses as much as digits as its factorization.

280513 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 280513 is about 529.6347798247. The cubic root of 280513 is about 65.4612555668.

Adding to 280513 its reverse (315082), we get a palindrome (595595).

The spelling of 280513 in words is "two hundred eighty thousand, five hundred thirteen".