214789681 has 2 divisors, whose sum is σ = 214789682. Its totient is φ = 214789680.

The previous prime is 214789657. The next prime is 214789721. The reversal of 214789681 is 186987412.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 197149681 + 17640000 = 14041^2 + 4200^2 .

It is a cyclic number.

It is not a de Polignac number, because 214789681 - 2¹¹ = 214787633 is a prime.

It is a super-4 number, since 4×214789681⁴ (a number of 34 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is not a weakly prime, because it can be changed into another prime (214789621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107394840 + 107394841.

It is an arithmetic number, because the mean of its divisors is an integer number (107394841).

Almost surely, 2^214789681 is an apocalyptic number.

It is an amenable number.

214789681 is a deficient number, since it is larger than the sum of its proper divisors (1).

214789681 is an equidigital number, since it uses as much as digits as its factorization.

214789681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 193536, while the sum is 46.

The square root of 214789681 is about 14655.7047254644. The cubic root of 214789681 is about 598.8772345661.

The spelling of 214789681 in words is "two hundred fourteen million, seven hundred eighty-nine thousand, six hundred eighty-one".