81012849 has 8 divisors (see below), whose sum is σ = 109629600. Its totient is φ = 53202336.

The previous prime is 81012839. The next prime is 81012853. The reversal of 81012849 is 94821018.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 81012849 - 2⁸ = 81012593 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81012809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 201324 + ... + 201725.

It is an arithmetic number, because the mean of its divisors is an integer number (13703700).

Almost surely, 2^81012849 is an apocalyptic number.

It is an amenable number.

81012849 is a deficient number, since it is larger than the sum of its proper divisors (28616751).

81012849 is a wasteful number, since it uses less digits than its factorization.

81012849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 403119.

The product of its (nonzero) digits is 4608, while the sum is 33.

The square root of 81012849 is about 9000.7138050268. The cubic root of 81012849 is about 432.6977482341.

The spelling of 81012849 in words is "eighty-one million, twelve thousand, eight hundred forty-nine".