239441981 has 2 divisors, whose sum is σ = 239441982. Its totient is φ = 239441980.

The previous prime is 239441977. The next prime is 239442023. The reversal of 239441981 is 189144932.

239441981 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 232837081 + 6604900 = 15259^2 + 2570^2 .

It is a cyclic number.

It is not a de Polignac number, because 239441981 - 2² = 239441977 is a prime.

It is a super-2 number, since 2×239441981² = 114664924530408722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (239441921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 119720990 + 119720991.

It is an arithmetic number, because the mean of its divisors is an integer number (119720991).

Almost surely, 2^239441981 is an apocalyptic number.

It is an amenable number.

239441981 is a deficient number, since it is larger than the sum of its proper divisors (1).

239441981 is an equidigital number, since it uses as much as digits as its factorization.

239441981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 62208, while the sum is 41.

The square root of 239441981 is about 15473.9129181988. The cubic root of 239441981 is about 620.9644899884.

The spelling of 239441981 in words is "two hundred thirty-nine million, four hundred forty-one thousand, nine hundred eighty-one".