81016753 has 2 divisors, whose sum is σ = 81016754. Its totient is φ = 81016752.

The previous prime is 81016739. The next prime is 81016759. The reversal of 81016753 is 35761018.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 64272289 + 16744464 = 8017^2 + 4092^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81016753 is a prime.

It is not a weakly prime, because it can be changed into another prime (81016759) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40508376 + 40508377.

It is an arithmetic number, because the mean of its divisors is an integer number (40508377).

Almost surely, 2^81016753 is an apocalyptic number.

It is an amenable number.

81016753 is a deficient number, since it is larger than the sum of its proper divisors (1).

81016753 is an equidigital number, since it uses as much as digits as its factorization.

81016753 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5040, while the sum is 31.

The square root of 81016753 is about 9000.9306741025. The cubic root of 81016753 is about 432.7046986743.

The spelling of 81016753 in words is "eighty-one million, sixteen thousand, seven hundred fifty-three".