81075315 has 8 divisors (see below), whose sum is σ = 129720528. Its totient is φ = 43240160.

The previous prime is 81075311. The next prime is 81075343. The reversal of 81075315 is 51357018.

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

It is not a de Polignac number, because 81075315 - 2² = 81075311 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81075311) 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, 2702496 + ... + 2702525.

It is an arithmetic number, because the mean of its divisors is an integer number (16215066).

Almost surely, 2^81075315 is an apocalyptic number.

81075315 is a deficient number, since it is larger than the sum of its proper divisors (48645213).

81075315 is a wasteful number, since it uses less digits than its factorization.

81075315 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5405029.

The product of its (nonzero) digits is 4200, while the sum is 30.

The square root of 81075315 is about 9004.1831944935. The cubic root of 81075315 is about 432.8089320519.

The spelling of 81075315 in words is "eighty-one million, seventy-five thousand, three hundred fifteen".