81700763 has 2 divisors, whose sum is σ = 81700764. Its totient is φ = 81700762.

The previous prime is 81700757. The next prime is 81700789. The reversal of 81700763 is 36700718.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81700763 - 2⁴ = 81700747 is a prime.

It is not a weakly prime, because it can be changed into another prime (81706763) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40850381 + 40850382.

It is an arithmetic number, because the mean of its divisors is an integer number (40850382).

Almost surely, 2^81700763 is an apocalyptic number.

81700763 is a deficient number, since it is larger than the sum of its proper divisors (1).

81700763 is an equidigital number, since it uses as much as digits as its factorization.

81700763 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7056, while the sum is 32.

The square root of 81700763 is about 9038.8474375885. The cubic root of 81700763 is about 433.9190371175.

The spelling of 81700763 in words is "eighty-one million, seven hundred thousand, seven hundred sixty-three".