280001369 has 2 divisors, whose sum is σ = 280001370. Its totient is φ = 280001368.

The previous prime is 280001357. The next prime is 280001377. The reversal of 280001369 is 963100082.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 254881225 + 25120144 = 15965^2 + 5012^2 .

It is a cyclic number.

It is not a de Polignac number, because 280001369 - 2⁴ = 280001353 is a prime.

It is a super-2 number, since 2×280001369² = 156801533283748322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (280001329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140000684 + 140000685.

It is an arithmetic number, because the mean of its divisors is an integer number (140000685).

Almost surely, 2^280001369 is an apocalyptic number.

It is an amenable number.

280001369 is a deficient number, since it is larger than the sum of its proper divisors (1).

280001369 is an equidigital number, since it uses as much as digits as its factorization.

280001369 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 280001369 is about 16733.2414373307. The cubic root of 280001369 is about 654.2143282478.

It can be divided in two parts, 2800013 and 69, that added together give a palindrome (2800082).

The spelling of 280001369 in words is "two hundred eighty million, one thousand, three hundred sixty-nine".