235841981 has 2 divisors, whose sum is σ = 235841982. Its totient is φ = 235841980.

The previous prime is 235841953. The next prime is 235841989. The reversal of 235841981 is 189148532.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 202606756 + 33235225 = 14234^2 + 5765^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-235841981 is a prime.

It is a super-2 number, since 2×235841981² = 111242880004008722, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (235841989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 117920990 + 117920991.

It is an arithmetic number, because the mean of its divisors is an integer number (117920991).

Almost surely, 2^235841981 is an apocalyptic number.

It is an amenable number.

235841981 is a deficient number, since it is larger than the sum of its proper divisors (1).

235841981 is an equidigital number, since it uses as much as digits as its factorization.

235841981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 69120, while the sum is 41.

The square root of 235841981 is about 15357.1475541521. The cubic root of 235841981 is about 617.8367036078.

The spelling of 235841981 in words is "two hundred thirty-five million, eight hundred forty-one thousand, nine hundred eighty-one".