81827741 has 2 divisors, whose sum is σ = 81827742. Its totient is φ = 81827740.

The previous prime is 81827731. The next prime is 81827761. The reversal of 81827741 is 14772818.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 55562116 + 26265625 = 7454^2 + 5125^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81827741 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 81827695 and 81827704.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81827701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40913870 + 40913871.

It is an arithmetic number, because the mean of its divisors is an integer number (40913871).

Almost surely, 2^81827741 is an apocalyptic number.

It is an amenable number.

81827741 is a deficient number, since it is larger than the sum of its proper divisors (1).

81827741 is an equidigital number, since it uses as much as digits as its factorization.

81827741 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25088, while the sum is 38.

The square root of 81827741 is about 9045.8687255564. The cubic root of 81827741 is about 434.1437174015.

The spelling of 81827741 in words is "eighty-one million, eight hundred twenty-seven thousand, seven hundred forty-one".