81229292 has 12 divisors (see below), whose sum is σ = 142285080. Its totient is φ = 40576416.

The previous prime is 81229289. The next prime is 81229333. The reversal of 81229292 is 29292218.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4478 + ... + 13509.

It is an arithmetic number, because the mean of its divisors is an integer number (11857090).

Almost surely, 2^81229292 is an apocalyptic number.

It is an amenable number.

81229292 is a deficient number, since it is larger than the sum of its proper divisors (61055788).

81229292 is a wasteful number, since it uses less digits than its factorization.

81229292 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19120 (or 19118 counting only the distinct ones).

The product of its digits is 10368, while the sum is 35.

The square root of 81229292 is about 9012.7294422944. The cubic root of 81229292 is about 433.0827534837.

The spelling of 81229292 in words is "eighty-one million, two hundred twenty-nine thousand, two hundred ninety-two".