235616681 has 2 divisors, whose sum is σ = 235616682. Its totient is φ = 235616680.

The previous prime is 235616659. The next prime is 235616683. The reversal of 235616681 is 186616532.

235616681 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., 235346281 + 270400 = 15341^2 + 520^2 .

It is a cyclic number.

It is not a de Polignac number, because 235616681 - 2²⁶ = 168507817 is a prime.

It is a super-2 number, since 2×235616681² = 111030440730911522, which contains 22 as substring.

Together with 235616683, 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 (235616683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 117808340 + 117808341.

It is an arithmetic number, because the mean of its divisors is an integer number (117808341).

Almost surely, 2^235616681 is an apocalyptic number.

It is an amenable number.

235616681 is a deficient number, since it is larger than the sum of its proper divisors (1).

235616681 is an equidigital number, since it uses as much as digits as its factorization.

235616681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 51840, while the sum is 38.

The square root of 235616681 is about 15349.8104548558. The cubic root of 235616681 is about 617.6399009891.

The spelling of 235616681 in words is "two hundred thirty-five million, six hundred sixteen thousand, six hundred eighty-one".