43141781 has 2 divisors, whose sum is σ = 43141782. Its totient is φ = 43141780.

The previous prime is 43141753. The next prime is 43141783. The reversal of 43141781 is 18714134.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 37576900 + 5564881 = 6130^2 + 2359^2 .

It is a cyclic number.

It is not a de Polignac number, because 43141781 - 2²² = 38947477 is a prime.

It is a super-2 number, since 2×43141781² = 3722426535703922, which contains 22 as substring.

Together with 43141783, it forms a pair of twin primes.

It is a Chen prime.

It is equal to p_2612594 and since 43141781 and 2612594 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43141783) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21570890 + 21570891.

It is an arithmetic number, because the mean of its divisors is an integer number (21570891).

Almost surely, 2^43141781 is an apocalyptic number.

It is an amenable number.

43141781 is a deficient number, since it is larger than the sum of its proper divisors (1).

43141781 is an equidigital number, since it uses as much as digits as its factorization.

43141781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2688, while the sum is 29.

The square root of 43141781 is about 6568.2403275154. The cubic root of 43141781 is about 350.7244342167.

The spelling of 43141781 in words is "forty-three million, one hundred forty-one thousand, seven hundred eighty-one".