418673681 has 2 divisors, whose sum is σ = 418673682. Its totient is φ = 418673680.

The previous prime is 418673653. The next prime is 418673707. The reversal of 418673681 is 186376814.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 348382225 + 70291456 = 18665^2 + 8384^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-418673681 is a prime.

It is a super-2 number, since 2×418673681² = 350575302324179522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (418673621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 209336840 + 209336841.

It is an arithmetic number, because the mean of its divisors is an integer number (209336841).

Almost surely, 2^418673681 is an apocalyptic number.

It is an amenable number.

418673681 is a deficient number, since it is larger than the sum of its proper divisors (1).

418673681 is an equidigital number, since it uses as much as digits as its factorization.

418673681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 193536, while the sum is 44.

The square root of 418673681 is about 20461.5170747430. The cubic root of 418673681 is about 748.0981032023.

The spelling of 418673681 in words is "four hundred eighteen million, six hundred seventy-three thousand, six hundred eighty-one".