81081296 has 20 divisors (see below), whose sum is σ = 166336452. Its totient is φ = 38155776.

The previous prime is 81081269. The next prime is 81081307. The reversal of 81081296 is 69218018.

It can be written as a sum of positive squares in 2 ways, for example, as 67831696 + 13249600 = 8236^2 + 3640^2 .

It is a super-2 number, since 2×81081296² = 13148353122079232, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 148775 + ... + 149318.

Almost surely, 2^81081296 is an apocalyptic number.

It is an amenable number.

81081296 is an abundant number, since it is smaller than the sum of its proper divisors (85255156).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81081296 is a wasteful number, since it uses less digits than its factorization.

81081296 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 298118 (or 298112 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 35.

The square root of 81081296 is about 9004.5153117755. The cubic root of 81081296 is about 432.8195746935.

The spelling of 81081296 in words is "eighty-one million, eighty-one thousand, two hundred ninety-six".