81838763 has 2 divisors, whose sum is σ = 81838764. Its totient is φ = 81838762.

The previous prime is 81838751. The next prime is 81838817. The reversal of 81838763 is 36783818.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81838763 - 2⁶ = 81838699 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is not a weakly prime, because it can be changed into another prime (81838963) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40919381 + 40919382.

It is an arithmetic number, because the mean of its divisors is an integer number (40919382).

Almost surely, 2^81838763 is an apocalyptic number.

81838763 is a deficient number, since it is larger than the sum of its proper divisors (1).

81838763 is an equidigital number, since it uses as much as digits as its factorization.

81838763 is an evil number, because the sum of its binary digits is even.

The product of its digits is 193536, while the sum is 44.

The square root of 81838763 is about 9046.4779334280. The cubic root of 81838763 is about 434.1632092314.

The spelling of 81838763 in words is "eighty-one million, eight hundred thirty-eight thousand, seven hundred sixty-three".