280537 has 2 divisors, whose sum is σ = 280538. Its totient is φ = 280536.

The previous prime is 280513. The next prime is 280541. The reversal of 280537 is 735082.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 175561 + 104976 = 419^2 + 324^2 .

It is a cyclic number.

It is not a de Polignac number, because 280537 - 2⁷ = 280409 is a prime.

It is not a weakly prime, because it can be changed into another prime (280507) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140268 + 140269.

It is an arithmetic number, because the mean of its divisors is an integer number (140269).

2²⁸⁰⁵³⁷ is an apocalyptic number.

It is an amenable number.

280537 is a deficient number, since it is larger than the sum of its proper divisors (1).

280537 is an equidigital number, since it uses as much as digits as its factorization.

280537 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1680, while the sum is 25.

The square root of 280537 is about 529.6574364625. The cubic root of 280537 is about 65.4631224147.

The spelling of 280537 in words is "two hundred eighty thousand, five hundred thirty-seven".