81726941 has 2 divisors, whose sum is σ = 81726942. Its totient is φ = 81726940.

The previous prime is 81726929. The next prime is 81726949. The reversal of 81726941 is 14962718.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 63664441 + 18062500 = 7979^2 + 4250^2 .

It is a cyclic number.

It is not a de Polignac number, because 81726941 - 2²⁶ = 14618077 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 81726895 and 81726904.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81726949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40863470 + 40863471.

It is an arithmetic number, because the mean of its divisors is an integer number (40863471).

Almost surely, 2^81726941 is an apocalyptic number.

It is an amenable number.

81726941 is a deficient number, since it is larger than the sum of its proper divisors (1).

81726941 is an equidigital number, since it uses as much as digits as its factorization.

81726941 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 24192, while the sum is 38.

The square root of 81726941 is about 9040.2954044655. The cubic root of 81726941 is about 433.9653766259.

The spelling of 81726941 in words is "eighty-one million, seven hundred twenty-six thousand, nine hundred forty-one".