81006463 has 2 divisors, whose sum is σ = 81006464. Its totient is φ = 81006462.

The previous prime is 81006451. The next prime is 81006491. The reversal of 81006463 is 36460018.

It is an a-pointer prime, because the next prime (81006491) can be obtained adding 81006463 to its sum of digits (28).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81006463 - 2¹³ = 80998271 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81006403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40503231 + 40503232.

It is an arithmetic number, because the mean of its divisors is an integer number (40503232).

Almost surely, 2^81006463 is an apocalyptic number.

81006463 is a deficient number, since it is larger than the sum of its proper divisors (1).

81006463 is an equidigital number, since it uses as much as digits as its factorization.

81006463 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 81006463 is about 9000.3590483936. The cubic root of 81006463 is about 432.6863785133.

The spelling of 81006463 in words is "eighty-one million, six thousand, four hundred sixty-three".