81276863 has 2 divisors, whose sum is σ = 81276864. Its totient is φ = 81276862.

The previous prime is 81276841. The next prime is 81276869. The reversal of 81276863 is 36867218.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81276863 - 2⁶ = 81276799 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 81276863.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81276869) 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, 40638431 + 40638432.

It is an arithmetic number, because the mean of its divisors is an integer number (40638432).

Almost surely, 2^81276863 is an apocalyptic number.

81276863 is a deficient number, since it is larger than the sum of its proper divisors (1).

81276863 is an equidigital number, since it uses as much as digits as its factorization.

81276863 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 96768, while the sum is 41.

The square root of 81276863 is about 9015.3681566534. The cubic root of 81276863 is about 433.1672802952.

The spelling of 81276863 in words is "eighty-one million, two hundred seventy-six thousand, eight hundred sixty-three".