81063503 has 2 divisors, whose sum is σ = 81063504. Its totient is φ = 81063502.

The previous prime is 81063487. The next prime is 81063517. The reversal of 81063503 is 30536018.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81063503 - 2⁴ = 81063487 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81063533) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40531751 + 40531752.

It is an arithmetic number, because the mean of its divisors is an integer number (40531752).

Almost surely, 2^81063503 is an apocalyptic number.

81063503 is a deficient number, since it is larger than the sum of its proper divisors (1).

81063503 is an equidigital number, since it uses as much as digits as its factorization.

81063503 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 81063503 is about 9003.5272532491. The cubic root of 81063503 is about 432.7879121422.

The spelling of 81063503 in words is "eighty-one million, sixty-three thousand, five hundred three".