81514015 has 16 divisors (see below), whose sum is σ = 107696160. Its totient is φ = 58734720.

The previous prime is 81513989. The next prime is 81514021. The reversal of 81514015 is 51041518.

It is a happy number.

It is not a de Polignac number, because 81514015 - 2⁹ = 81513503 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 804 + ... + 12793.

It is an arithmetic number, because the mean of its divisors is an integer number (6731010).

Almost surely, 2^81514015 is an apocalyptic number.

81514015 is a deficient number, since it is larger than the sum of its proper divisors (26182145).

81514015 is a wasteful number, since it uses less digits than its factorization.

81514015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13722.

The product of its (nonzero) digits is 800, while the sum is 25.

The square root of 81514015 is about 9028.5112283255. The cubic root of 81514015 is about 433.5881739006.

The spelling of 81514015 in words is "eighty-one million, five hundred fourteen thousand, fifteen".