280643201 has 2 divisors, whose sum is σ = 280643202. Its totient is φ = 280643200.

The previous prime is 280643189. The next prime is 280643219. The reversal of 280643201 is 102346082.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 149426176 + 131217025 = 12224^2 + 11455^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-280643201 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (280640201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140321600 + 140321601.

It is an arithmetic number, because the mean of its divisors is an integer number (140321601).

Almost surely, 2^280643201 is an apocalyptic number.

It is an amenable number.

280643201 is a deficient number, since it is larger than the sum of its proper divisors (1).

280643201 is an equidigital number, since it uses as much as digits as its factorization.

280643201 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 280643201 is about 16752.4088118694. The cubic root of 280643201 is about 654.7138201675.

Adding to 280643201 its reverse (102346082), we get a palindrome (382989283).

The spelling of 280643201 in words is "two hundred eighty million, six hundred forty-three thousand, two hundred one".