81335229 has 4 divisors (see below), whose sum is σ = 108446976. Its totient is φ = 54223484.

The previous prime is 81335209. The next prime is 81335237. The reversal of 81335229 is 92253318.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 81335229 - 2⁵ = 81335197 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 81335229.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81335209) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13555869 + ... + 13555874.

It is an arithmetic number, because the mean of its divisors is an integer number (27111744).

Almost surely, 2^81335229 is an apocalyptic number.

It is an amenable number.

81335229 is a deficient number, since it is larger than the sum of its proper divisors (27111747).

81335229 is a wasteful number, since it uses less digits than its factorization.

81335229 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27111746.

The product of its digits is 12960, while the sum is 33.

The square root of 81335229 is about 9018.6046038176. The cubic root of 81335229 is about 433.2709432202.

The spelling of 81335229 in words is "eighty-one million, three hundred thirty-five thousand, two hundred twenty-nine".