81517206 has 8 divisors (see below), whose sum is σ = 163034424. Its totient is φ = 27172400.

The previous prime is 81517171. The next prime is 81517211. The reversal of 81517206 is 60271518.

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

81517206 is an admirable number.

It is a congruent 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, 6793095 + ... + 6793106.

It is an arithmetic number, because the mean of its divisors is an integer number (20379303).

Almost surely, 2^81517206 is an apocalyptic number.

81517206 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.

81517206 is a wasteful number, since it uses less digits than its factorization.

81517206 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13586206.

The product of its (nonzero) digits is 3360, while the sum is 30.

The square root of 81517206 is about 9028.6879445465. The cubic root of 81517206 is about 433.5938316672.

The spelling of 81517206 in words is "eighty-one million, five hundred seventeen thousand, two hundred six".