280271021 has 2 divisors, whose sum is σ = 280271022. Its totient is φ = 280271020.

The previous prime is 280270987. The next prime is 280271053. The reversal of 280271021 is 120172082.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 275095396 + 5175625 = 16586^2 + 2275^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-280271021 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (280271521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140135510 + 140135511.

It is an arithmetic number, because the mean of its divisors is an integer number (140135511).

Almost surely, 2^280271021 is an apocalyptic number.

It is an amenable number.

280271021 is a deficient number, since it is larger than the sum of its proper divisors (1).

280271021 is an equidigital number, since it uses as much as digits as its factorization.

280271021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 448, while the sum is 23.

The square root of 280271021 is about 16741.2968733011. The cubic root of 280271021 is about 654.4242719861.

The spelling of 280271021 in words is "two hundred eighty million, two hundred seventy-one thousand, twenty-one".