81652219 has 8 divisors (see below), whose sum is σ = 89171712. Its totient is φ = 74148840.

The previous prime is 81652217. The next prime is 81652243. The reversal of 81652219 is 91225618.

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 81652219 - 2¹ = 81652217 is a prime.

It is a super-2 number, since 2×81652219² = 13334169735247922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81652217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8202 + ... + 15184.

It is an arithmetic number, because the mean of its divisors is an integer number (11146464).

Almost surely, 2^81652219 is an apocalyptic number.

81652219 is a deficient number, since it is larger than the sum of its proper divisors (7519493).

81652219 is a wasteful number, since it uses less digits than its factorization.

81652219 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8057.

The product of its digits is 8640, while the sum is 34.

The square root of 81652219 is about 9036.1617404737. The cubic root of 81652219 is about 433.8330797848.

It can be divided in two parts, 816 and 52219, that added together give a palindrome (53035).

The spelling of 81652219 in words is "eighty-one million, six hundred fifty-two thousand, two hundred nineteen".