81002905253 has 2 divisors, whose sum is σ = 81002905254. Its totient is φ = 81002905252.

The previous prime is 81002905237. The next prime is 81002905273. The reversal of 81002905253 is 35250920018.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 45734816449 + 35268088804 = 213857^2 + 187798^2 .

It is a cyclic number.

It is not a de Polignac number, because 81002905253 - 2⁴ = 81002905237 is a prime.

It is a super-2 number, since 2×81002905253² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81002905213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40501452626 + 40501452627.

It is an arithmetic number, because the mean of its divisors is an integer number (40501452627).

Almost surely, 2^81002905253 is an apocalyptic number.

It is an amenable number.

81002905253 is a deficient number, since it is larger than the sum of its proper divisors (1).

81002905253 is an equidigital number, since it uses as much as digits as its factorization.

81002905253 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21600, while the sum is 35.

The spelling of 81002905253 in words is "eighty-one billion, two million, nine hundred five thousand, two hundred fifty-three".