81049715 has 8 divisors (see below), whose sum is σ = 97749600. Its totient is φ = 64513152.

The previous prime is 81049691. The next prime is 81049729. The reversal of 81049715 is 51794018.

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

It is a cyclic number.

It is not a de Polignac number, because 81049715 - 2¹⁰ = 81048691 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39734 + ... + 41723.

It is an arithmetic number, because the mean of its divisors is an integer number (12218700).

Almost surely, 2^81049715 is an apocalyptic number.

81049715 is a deficient number, since it is larger than the sum of its proper divisors (16699885).

81049715 is a wasteful number, since it uses less digits than its factorization.

81049715 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81661.

The product of its (nonzero) digits is 10080, while the sum is 35.

The square root of 81049715 is about 9002.7615207779. The cubic root of 81049715 is about 432.7633732812.

The spelling of 81049715 in words is "eighty-one million, forty-nine thousand, seven hundred fifteen".