81517386 has 8 divisors (see below), whose sum is σ = 163034784. Its totient is φ = 27172460.

The previous prime is 81517369. The next prime is 81517417. The reversal of 81517386 is 68371518.

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

81517386 is an admirable number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6793110 + ... + 6793121.

It is an arithmetic number, because the mean of its divisors is an integer number (20379348).

Almost surely, 2^81517386 is an apocalyptic number.

81517386 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81517386 is a wasteful number, since it uses less digits than its factorization.

81517386 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13586236.

The product of its digits is 40320, while the sum is 39.

The square root of 81517386 is about 9028.6979127668. The cubic root of 81517386 is about 433.5941508098.

The spelling of 81517386 in words is "eighty-one million, five hundred seventeen thousand, three hundred eighty-six".