81024515 has 48 divisors (see below), whose sum is σ = 120165120. Its totient is φ = 51891840.

The previous prime is 81024511. The next prime is 81024547. The reversal of 81024515 is 51542018.

It is not a de Polignac number, because 81024515 - 2² = 81024511 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81024511) 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 47 ways as a sum of consecutive naturals, for example, 213596 + ... + 213974.

It is an arithmetic number, because the mean of its divisors is an integer number (2503440).

Almost surely, 2^81024515 is an apocalyptic number.

81024515 is a deficient number, since it is larger than the sum of its proper divisors (39140605).

81024515 is a wasteful number, since it uses less digits than its factorization.

81024515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 444 (or 431 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 26.

The square root of 81024515 is about 9001.3618414104. The cubic root of 81024515 is about 432.7185169958.

The spelling of 81024515 in words is "eighty-one million, twenty-four thousand, five hundred fifteen".