81080121 has 8 divisors (see below), whose sum is σ = 108239040. Its totient is φ = 53987312.

The previous prime is 81080107. The next prime is 81080141. The reversal of 81080121 is 12108018.

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 81080121 - 2⁶ = 81080057 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81080141) 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, 13590 + ... + 18623.

It is an arithmetic number, because the mean of its divisors is an integer number (13529880).

Almost surely, 2^81080121 is an apocalyptic number.

It is an amenable number.

81080121 is a deficient number, since it is larger than the sum of its proper divisors (27158919).

81080121 is a wasteful number, since it uses less digits than its factorization.

81080121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33055.

The product of its (nonzero) digits is 128, while the sum is 21.

The square root of 81080121 is about 9004.4500664949. The cubic root of 81080121 is about 432.8174839300.

Adding to 81080121 its reverse (12108018), we get a palindrome (93188139).

The spelling of 81080121 in words is "eighty-one million, eighty thousand, one hundred twenty-one".