81002905273 has 2 divisors, whose sum is σ = 81002905274. Its totient is φ = 81002905272.

The previous prime is 81002905253. The next prime is 81002905309. The reversal of 81002905273 is 37250920018.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 80367714064 + 635191209 = 283492^2 + 25203^2 .

It is a cyclic number.

It is not a de Polignac number, because 81002905273 - 2⁹ = 81002904761 is a prime.

It is a super-2 number, since 2×81002905273² (a number of 23 digits) contains 22 as substring.

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

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40501452636 + 40501452637.

It is an arithmetic number, because the mean of its divisors is an integer number (40501452637).

Almost surely, 2^81002905273 is an apocalyptic number.

It is an amenable number.

81002905273 is a deficient number, since it is larger than the sum of its proper divisors (1).

81002905273 is an equidigital number, since it uses as much as digits as its factorization.

81002905273 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 30240, while the sum is 37.

The spelling of 81002905273 in words is "eighty-one billion, two million, nine hundred five thousand, two hundred seventy-three".