81189041 has 2 divisors, whose sum is σ = 81189042. Its totient is φ = 81189040.

The previous prime is 81189037. The next prime is 81189079. The reversal of 81189041 is 14098118.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 72165025 + 9024016 = 8495^2 + 3004^2 .

It is a cyclic number.

It is not a de Polignac number, because 81189041 - 2² = 81189037 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 81188989 and 81189007.

It is not a weakly prime, because it can be changed into another prime (81186041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40594520 + 40594521.

It is an arithmetic number, because the mean of its divisors is an integer number (40594521).

Almost surely, 2^81189041 is an apocalyptic number.

It is an amenable number.

81189041 is a deficient number, since it is larger than the sum of its proper divisors (1).

81189041 is an equidigital number, since it uses as much as digits as its factorization.

81189041 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2304, while the sum is 32.

The square root of 81189041 is about 9010.4961572602. The cubic root of 81189041 is about 433.0112074785.

The spelling of 81189041 in words is "eighty-one million, one hundred eighty-nine thousand, forty-one".