81015683 has 16 divisors (see below), whose sum is σ = 96890880. Its totient is φ = 66233376.

The previous prime is 81015653. The next prime is 81015691. The reversal of 81015683 is 38651018.

It is not a de Polignac number, because 81015683 - 2⁸ = 81015427 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81015643) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 97313 + ... + 98141.

It is an arithmetic number, because the mean of its divisors is an integer number (6055680).

Almost surely, 2^81015683 is an apocalyptic number.

81015683 is a deficient number, since it is larger than the sum of its proper divisors (15875197).

81015683 is a wasteful number, since it uses less digits than its factorization.

81015683 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1466.

The product of its (nonzero) digits is 5760, while the sum is 32.

The square root of 81015683 is about 9000.8712356083. The cubic root of 81015683 is about 432.7027937347.

The spelling of 81015683 in words is "eighty-one million, fifteen thousand, six hundred eighty-three".