41181781 has 2 divisors, whose sum is σ = 41181782. Its totient is φ = 41181780.

The previous prime is 41181779. The next prime is 41181817. The reversal of 41181781 is 18718114.

Together with next prime (41181817) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 31259281 + 9922500 = 5591^2 + 3150^2 .

It is a cyclic number.

It is not a de Polignac number, because 41181781 - 2¹ = 41181779 is a prime.

It is a super-2 number, since 2×41181781² = 3391878172663922, which contains 22 as substring.

Together with 41181779, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (41181731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20590890 + 20590891.

It is an arithmetic number, because the mean of its divisors is an integer number (20590891).

Almost surely, 2^41181781 is an apocalyptic number.

It is an amenable number.

41181781 is a deficient number, since it is larger than the sum of its proper divisors (1).

41181781 is an equidigital number, since it uses as much as digits as its factorization.

41181781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1792, while the sum is 31.

The square root of 41181781 is about 6417.3032498083. The cubic root of 41181781 is about 345.3305828017.

Adding to 41181781 its reverse (18718114), we get a palindrome (59899895).

The spelling of 41181781 in words is "forty-one million, one hundred eighty-one thousand, seven hundred eighty-one".