81530086 has 16 divisors (see below), whose sum is σ = 133554240. Its totient is φ = 37019880.

The previous prime is 81530051. The next prime is 81530087. The reversal of 81530086 is 68003518.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81530087) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 33565 + ... + 35911.

It is an arithmetic number, because the mean of its divisors is an integer number (8347140).

Almost surely, 2^81530086 is an apocalyptic number.

81530086 is a deficient number, since it is larger than the sum of its proper divisors (52024154).

81530086 is a wasteful number, since it uses less digits than its factorization.

81530086 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3939.

The product of its (nonzero) digits is 5760, while the sum is 31.

The square root of 81530086 is about 9029.4011983077. The cubic root of 81530086 is about 433.6166669054.

The spelling of 81530086 in words is "eighty-one million, five hundred thirty thousand, eighty-six".