81004753 has 2 divisors, whose sum is σ = 81004754. Its totient is φ = 81004752.

The previous prime is 81004751. The next prime is 81004769. The reversal of 81004753 is 35740018.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 63632529 + 17372224 = 7977^2 + 4168^2 .

It is a cyclic number.

It is not a de Polignac number, because 81004753 - 2¹ = 81004751 is a prime.

Together with 81004751, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (81004751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40502376 + 40502377.

It is an arithmetic number, because the mean of its divisors is an integer number (40502377).

Almost surely, 2^81004753 is an apocalyptic number.

It is an amenable number.

81004753 is a deficient number, since it is larger than the sum of its proper divisors (1).

81004753 is an equidigital number, since it uses as much as digits as its factorization.

81004753 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3360, while the sum is 28.

The square root of 81004753 is about 9000.2640516820. The cubic root of 81004753 is about 432.6833339047.

The spelling of 81004753 in words is "eighty-one million, four thousand, seven hundred fifty-three".