81741941 has 2 divisors, whose sum is σ = 81741942. Its totient is φ = 81741940.

The previous prime is 81741929. The next prime is 81741949. The reversal of 81741941 is 14914718.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 58461316 + 23280625 = 7646^2 + 4825^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81741941 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81741949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40870970 + 40870971.

It is an arithmetic number, because the mean of its divisors is an integer number (40870971).

Almost surely, 2^81741941 is an apocalyptic number.

It is an amenable number.

81741941 is a deficient number, since it is larger than the sum of its proper divisors (1).

81741941 is an equidigital number, since it uses as much as digits as its factorization.

81741941 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8064, while the sum is 35.

The square root of 81741941 is about 9041.1249853102. The cubic root of 81741941 is about 433.9919247154.

The spelling of 81741941 in words is "eighty-one million, seven hundred forty-one thousand, nine hundred forty-one".