81322207 has 8 divisors (see below), whose sum is σ = 84049920. Its totient is φ = 78601080.

The previous prime is 81322201. The next prime is 81322231. The reversal of 81322207 is 70222318.

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 81322207 - 2¹¹ = 81320159 is a prime.

It is a super-2 number, since 2×81322207² = 13226602702701698, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81322201) 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, 43698 + ... + 45520.

It is an arithmetic number, because the mean of its divisors is an integer number (10506240).

Almost surely, 2^81322207 is an apocalyptic number.

81322207 is a deficient number, since it is larger than the sum of its proper divisors (2727713).

81322207 is a wasteful number, since it uses less digits than its factorization.

81322207 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3293.

The product of its (nonzero) digits is 1344, while the sum is 25.

The square root of 81322207 is about 9017.8826228777. The cubic root of 81322207 is about 433.2478193520.

The spelling of 81322207 in words is "eighty-one million, three hundred twenty-two thousand, two hundred seven".