81054515 has 8 divisors (see below), whose sum is σ = 97803888. Its totient is φ = 64484640.

The previous prime is 81054509. The next prime is 81054517. The reversal of 81054515 is 51545018.

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

It is not a de Polignac number, because 81054515 - 2⁶ = 81054451 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81054517) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43877 + ... + 45686.

It is an arithmetic number, because the mean of its divisors is an integer number (12225486).

Almost surely, 2^81054515 is an apocalyptic number.

81054515 is a deficient number, since it is larger than the sum of its proper divisors (16749373).

81054515 is a wasteful number, since it uses less digits than its factorization.

81054515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89749.

The product of its (nonzero) digits is 4000, while the sum is 29.

The square root of 81054515 is about 9003.0281017000. The cubic root of 81054515 is about 432.7719162814.

The spelling of 81054515 in words is "eighty-one million, fifty-four thousand, five hundred fifteen".