81041963 has 2 divisors, whose sum is σ = 81041964. Its totient is φ = 81041962.

The previous prime is 81041911. The next prime is 81041969. The reversal of 81041963 is 36914018.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81041963 - 2¹² = 81037867 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (81041969) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40520981 + 40520982.

It is an arithmetic number, because the mean of its divisors is an integer number (40520982).

Almost surely, 2^81041963 is an apocalyptic number.

81041963 is a deficient number, since it is larger than the sum of its proper divisors (1).

81041963 is an equidigital number, since it uses as much as digits as its factorization.

81041963 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 81041963 is about 9002.3309759195. The cubic root of 81041963 is about 432.7495756237.

The spelling of 81041963 in words is "eighty-one million, forty-one thousand, nine hundred sixty-three".