81596217 has 8 divisors (see below), whose sum is σ = 108895840. Its totient is φ = 54347040.

The previous prime is 81596189. The next prime is 81596219. The reversal of 81596217 is 71269518.

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

It is not a de Polignac number, because 81596217 - 2¹⁴ = 81579833 is a prime.

It is a super-2 number, since 2×81596217² = 13315885257422178, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81596219) 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, 8659 + ... + 15432.

It is an arithmetic number, because the mean of its divisors is an integer number (13611980).

Almost surely, 2^81596217 is an apocalyptic number.

It is an amenable number.

81596217 is a deficient number, since it is larger than the sum of its proper divisors (27299623).

81596217 is a wasteful number, since it uses less digits than its factorization.

81596217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25223.

The product of its digits is 30240, while the sum is 39.

The square root of 81596217 is about 9033.0624375125. The cubic root of 81596217 is about 433.7338741662.

The spelling of 81596217 in words is "eighty-one million, five hundred ninety-six thousand, two hundred seventeen".