280957 has 2 divisors, whose sum is σ = 280958. Its totient is φ = 280956.

The previous prime is 280949. The next prime is 280963. The reversal of 280957 is 759082.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 171396 + 109561 = 414^2 + 331^2 .

It is a cyclic number.

It is not a de Polignac number, because 280957 - 2³ = 280949 is a prime.

It is a congruent number.

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, 140478 + 140479.

It is an arithmetic number, because the mean of its divisors is an integer number (140479).

2²⁸⁰⁹⁵⁷ is an apocalyptic number.

It is an amenable number.

280957 is a deficient number, since it is larger than the sum of its proper divisors (1).

280957 is an equidigital number, since it uses as much as digits as its factorization.

280957 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5040, while the sum is 31.

The square root of 280957 is about 530.0537708573. The cubic root of 280957 is about 65.4957750320.

The spelling of 280957 in words is "two hundred eighty thousand, nine hundred fifty-seven".