81922299 has 8 divisors (see below), whose sum is σ = 109346112. Its totient is φ = 54556680.

The previous prime is 81922283. The next prime is 81922349. The reversal of 81922299 is 99222918.

It is a happy number.

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

It is not a de Polignac number, because 81922299 - 2⁴ = 81922283 is a prime.

It is a super-2 number, since 2×81922299² = 13422526146890802, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 81922299.

It is not an unprimeable number, because it can be changed into a prime (81922219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11149 + ... + 16974.

It is an arithmetic number, because the mean of its divisors is an integer number (13668264).

Almost surely, 2^81922299 is an apocalyptic number.

81922299 is a deficient number, since it is larger than the sum of its proper divisors (27423813).

81922299 is a wasteful number, since it uses less digits than its factorization.

81922299 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29097.

The product of its digits is 46656, while the sum is 42.

The square root of 81922299 is about 9051.0938013038. The cubic root of 81922299 is about 434.3108814076.

The spelling of 81922299 in words is "eighty-one million, nine hundred twenty-two thousand, two hundred ninety-nine".