408500219681 has 2 divisors, whose sum is σ = 408500219682. Its totient is φ = 408500219680.

The previous prime is 408500219663. The next prime is 408500219761. The reversal of 408500219681 is 186912005804.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 346938670225 + 61561549456 = 589015^2 + 248116^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-408500219681 is a prime.

It is a super-2 number, since 2×408500219681² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (408500219641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 204250109840 + 204250109841.

It is an arithmetic number, because the mean of its divisors is an integer number (204250109841).

Almost surely, 2^408500219681 is an apocalyptic number.

It is an amenable number.

408500219681 is a deficient number, since it is larger than the sum of its proper divisors (1).

408500219681 is an equidigital number, since it uses as much as digits as its factorization.

408500219681 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 138240, while the sum is 44.

The spelling of 408500219681 in words is "four hundred eight billion, five hundred million, two hundred nineteen thousand, six hundred eighty-one".