280383221 has 2 divisors, whose sum is σ = 280383222. Its totient is φ = 280383220.

The previous prime is 280383199. The next prime is 280383289. The reversal of 280383221 is 122383082.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 151560721 + 128822500 = 12311^2 + 11350^2 .

It is a cyclic number.

It is not a de Polignac number, because 280383221 - 2²² = 276188917 is a prime.

It is a super-2 number, since 2×280383221² = 157229501236669682, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (280383721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140191610 + 140191611.

It is an arithmetic number, because the mean of its divisors is an integer number (140191611).

Almost surely, 2^280383221 is an apocalyptic number.

It is an amenable number.

280383221 is a deficient number, since it is larger than the sum of its proper divisors (1).

280383221 is an equidigital number, since it uses as much as digits as its factorization.

280383221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4608, while the sum is 29.

The square root of 280383221 is about 16744.6475328685. The cubic root of 280383221 is about 654.5115881929.

The spelling of 280383221 in words is "two hundred eighty million, three hundred eighty-three thousand, two hundred twenty-one".