408561281 has 2 divisors, whose sum is σ = 408561282. Its totient is φ = 408561280.

The previous prime is 408561239. The next prime is 408561287. The reversal of 408561281 is 182165804.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 211411600 + 197149681 = 14540^2 + 14041^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-408561281 is a prime.

It is a super-2 number, since 2×408561281² = 333844640664721922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (408561287) 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, 204280640 + 204280641.

It is an arithmetic number, because the mean of its divisors is an integer number (204280641).

Almost surely, 2^408561281 is an apocalyptic number.

It is an amenable number.

408561281 is a deficient number, since it is larger than the sum of its proper divisors (1).

408561281 is an equidigital number, since it uses as much as digits as its factorization.

408561281 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15360, while the sum is 35.

The square root of 408561281 is about 20212.8988767074. The cubic root of 408561281 is about 742.0259076788.

The spelling of 408561281 in words is "four hundred eight million, five hundred sixty-one thousand, two hundred eighty-one".