81342763 has 2 divisors, whose sum is σ = 81342764. Its totient is φ = 81342762.

The previous prime is 81342733. The next prime is 81342787. The reversal of 81342763 is 36724318.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81342763 is a prime.

It is not a weakly prime, because it can be changed into another prime (81342733) 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, 40671381 + 40671382.

It is an arithmetic number, because the mean of its divisors is an integer number (40671382).

Almost surely, 2^81342763 is an apocalyptic number.

81342763 is a deficient number, since it is larger than the sum of its proper divisors (1).

81342763 is an equidigital number, since it uses as much as digits as its factorization.

81342763 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 24192, while the sum is 34.

The square root of 81342763 is about 9019.0222862570. The cubic root of 81342763 is about 433.2843206236.

The spelling of 81342763 in words is "eighty-one million, three hundred forty-two thousand, seven hundred sixty-three".