4213681 has 2 divisors, whose sum is σ = 4213682. Its totient is φ = 4213680.

The previous prime is 4213679. The next prime is 4213717. The reversal of 4213681 is 1863124.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3549456 + 664225 = 1884^2 + 815^2 .

It is a cyclic number.

It is not a de Polignac number, because 4213681 - 2¹ = 4213679 is a prime.

It is a super-2 number, since 2×4213681² = 35510215139522, which contains 22 as substring.

Together with 4213679, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (4213081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2106840 + 2106841.

It is an arithmetic number, because the mean of its divisors is an integer number (2106841).

Almost surely, 2^4213681 is an apocalyptic number.

It is an amenable number.

4213681 is a deficient number, since it is larger than the sum of its proper divisors (1).

4213681 is an equidigital number, since it uses as much as digits as its factorization.

4213681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1152, while the sum is 25.

The square root of 4213681 is about 2052.7252616948. The cubic root of 4213681 is about 161.5178597891.

The spelling of 4213681 in words is "four million, two hundred thirteen thousand, six hundred eighty-one".