213859681 has 16 divisors (see below), whose sum is σ = 255483648. Its totient is φ = 175032000.

The previous prime is 213859673. The next prime is 213859691. The reversal of 213859681 is 186958312.

It is a cyclic number.

It is not a de Polignac number, because 213859681 - 2³ = 213859673 is a prime.

It is a super-2 number, since 2×213859681² = 91471926314843522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (213859631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 163731 + ... + 165031.

It is an arithmetic number, because the mean of its divisors is an integer number (15967728).

Almost surely, 2^213859681 is an apocalyptic number.

It is an amenable number.

213859681 is a deficient number, since it is larger than the sum of its proper divisors (41623967).

213859681 is a wasteful number, since it uses less digits than its factorization.

213859681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2352.

The product of its digits is 103680, while the sum is 43.

The square root of 213859681 is about 14623.9420472046. The cubic root of 213859681 is about 598.0116411420.

The spelling of 213859681 in words is "two hundred thirteen million, eight hundred fifty-nine thousand, six hundred eighty-one".