235556681 has 2 divisors, whose sum is σ = 235556682. Its totient is φ = 235556680.

The previous prime is 235556663. The next prime is 235556683. The reversal of 235556681 is 186655532.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 235315600 + 241081 = 15340^2 + 491^2 .

It is a cyclic number.

It is not a de Polignac number, because 235556681 - 2²⁶ = 168447817 is a prime.

It is a super-2 number, since 2×235556681² = 110973899927471522, which contains 22 as substring.

Together with 235556683, 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 (235556683) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 117778340 + 117778341.

It is an arithmetic number, because the mean of its divisors is an integer number (117778341).

Almost surely, 2^235556681 is an apocalyptic number.

It is an amenable number.

235556681 is a deficient number, since it is larger than the sum of its proper divisors (1).

235556681 is an equidigital number, since it uses as much as digits as its factorization.

235556681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 216000, while the sum is 41.

The square root of 235556681 is about 15347.8559088884. The cubic root of 235556681 is about 617.5874690193.

The spelling of 235556681 in words is "two hundred thirty-five million, five hundred fifty-six thousand, six hundred eighty-one".