81069121 has 8 divisors (see below), whose sum is σ = 93692160. Its totient is φ = 68706528.

The previous prime is 81069103. The next prime is 81069133. The reversal of 81069121 is 12196018.

It is a happy number.

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 81069121 - 2⁹ = 81068609 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 81069121.

It is not an unprimeable number, because it can be changed into a prime (81069161) 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, 64441 + ... + 65686.

It is an arithmetic number, because the mean of its divisors is an integer number (11711520).

Almost surely, 2^81069121 is an apocalyptic number.

It is an amenable number.

81069121 is a deficient number, since it is larger than the sum of its proper divisors (12623039).

81069121 is a wasteful number, since it uses less digits than its factorization.

81069121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130223.

The product of its (nonzero) digits is 864, while the sum is 28.

The square root of 81069121 is about 9003.8392366812. The cubic root of 81069121 is about 432.7979098445.

The spelling of 81069121 in words is "eighty-one million, sixty-nine thousand, one hundred twenty-one".