81089229 has 16 divisors (see below), whose sum is σ = 118177472. Its totient is φ = 49154688.

The previous prime is 81089219. The next prime is 81089263. The reversal of 81089229 is 92298018.

It is not a de Polignac number, because 81089229 - 2⁴ = 81089213 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81089219) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12904 + ... + 18129.

It is an arithmetic number, because the mean of its divisors is an integer number (7386092).

Almost surely, 2^81089229 is an apocalyptic number.

It is an amenable number.

81089229 is a deficient number, since it is larger than the sum of its proper divisors (37088243).

81089229 is a wasteful number, since it uses less digits than its factorization.

81089229 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31116.

The product of its (nonzero) digits is 20736, while the sum is 39.

The square root of 81089229 is about 9004.9558022236. The cubic root of 81089229 is about 432.8336899329.

It can be divided in two parts, 81089 and 229, that added together give a palindrome (81318).

The spelling of 81089229 in words is "eighty-one million, eighty-nine thousand, two hundred twenty-nine".