81452653 has 2 divisors, whose sum is σ = 81452654. Its totient is φ = 81452652.

The previous prime is 81452647. The next prime is 81452663. The reversal of 81452653 is 35625418.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 81396484 + 56169 = 9022^2 + 237^2 .

It is a cyclic number.

It is not a de Polignac number, because 81452653 - 2²¹ = 79355501 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81452633) 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, 40726326 + 40726327.

It is an arithmetic number, because the mean of its divisors is an integer number (40726327).

Almost surely, 2^81452653 is an apocalyptic number.

It is an amenable number.

81452653 is a deficient number, since it is larger than the sum of its proper divisors (1).

81452653 is an equidigital number, since it uses as much as digits as its factorization.

81452653 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 28800, while the sum is 34.

The square root of 81452653 is about 9025.1123538713. The cubic root of 81452653 is about 433.4793479668.

The spelling of 81452653 in words is "eighty-one million, four hundred fifty-two thousand, six hundred fifty-three".