214709681 has 2 divisors, whose sum is σ = 214709682. Its totient is φ = 214709680.

The previous prime is 214709639. The next prime is 214709683. The reversal of 214709681 is 186907412.

214709681 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 119159056 + 95550625 = 10916^2 + 9775^2 .

It is a cyclic number.

It is not a de Polignac number, because 214709681 - 2²² = 210515377 is a prime.

It is a super-2 number, since 2×214709681² = 92200494230243522, which contains 22 as substring.

Together with 214709683, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (214709683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107354840 + 107354841.

It is an arithmetic number, because the mean of its divisors is an integer number (107354841).

Almost surely, 2^214709681 is an apocalyptic number.

It is an amenable number.

214709681 is a deficient number, since it is larger than the sum of its proper divisors (1).

214709681 is an equidigital number, since it uses as much as digits as its factorization.

214709681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24192, while the sum is 38.

The square root of 214709681 is about 14652.9751586495. The cubic root of 214709681 is about 598.8028732530.

The spelling of 214709681 in words is "two hundred fourteen million, seven hundred nine thousand, six hundred eighty-one".