81003763 has 2 divisors, whose sum is σ = 81003764. Its totient is φ = 81003762.

The previous prime is 81003761. The next prime is 81003781. The reversal of 81003763 is 36730018.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81003763 - 2¹ = 81003761 is a prime.

Together with 81003761, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (81003761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40501881 + 40501882.

It is an arithmetic number, because the mean of its divisors is an integer number (40501882).

Almost surely, 2^81003763 is an apocalyptic number.

81003763 is a deficient number, since it is larger than the sum of its proper divisors (1).

81003763 is an equidigital number, since it uses as much as digits as its factorization.

81003763 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3024, while the sum is 28.

The square root of 81003763 is about 9000.2090531276. The cubic root of 81003763 is about 432.6815712170.

The spelling of 81003763 in words is "eighty-one million, three thousand, seven hundred sixty-three".