280305001 has 2 divisors, whose sum is σ = 280305002. Its totient is φ = 280305000.

The previous prime is 280304977. The next prime is 280305041. The reversal of 280305001 is 100503082.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 271755225 + 8549776 = 16485^2 + 2924^2 .

It is a cyclic number.

It is not a de Polignac number, because 280305001 - 2⁷ = 280304873 is a prime.

It is a super-2 number, since 2×280305001² = 157141787171220002, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 280305001.

It is not a weakly prime, because it can be changed into another prime (280305041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140152500 + 140152501.

It is an arithmetic number, because the mean of its divisors is an integer number (140152501).

Almost surely, 2^280305001 is an apocalyptic number.

It is an amenable number.

280305001 is a deficient number, since it is larger than the sum of its proper divisors (1).

280305001 is an equidigital number, since it uses as much as digits as its factorization.

280305001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 280305001 is about 16742.3116982094. The cubic root of 280305001 is about 654.4507183380.

Adding to 280305001 its reverse (100503082), we get a palindrome (380808083).

The spelling of 280305001 in words is "two hundred eighty million, three hundred five thousand, one".