280065391 has 2 divisors, whose sum is σ = 280065392. Its totient is φ = 280065390.

The previous prime is 280065367. The next prime is 280065413. The reversal of 280065391 is 193560082.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-280065391 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (280065311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140032695 + 140032696.

It is an arithmetic number, because the mean of its divisors is an integer number (140032696).

Almost surely, 2^280065391 is an apocalyptic number.

280065391 is a deficient number, since it is larger than the sum of its proper divisors (1).

280065391 is an equidigital number, since it uses as much as digits as its factorization.

280065391 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12960, while the sum is 34.

The square root of 280065391 is about 16735.1543464648. The cubic root of 280065391 is about 654.2641862396.

The spelling of 280065391 in words is "two hundred eighty million, sixty-five thousand, three hundred ninety-one".