81832121 has 8 divisors (see below), whose sum is σ = 93595200. Its totient is φ = 70087248.

The previous prime is 81832117. The next prime is 81832133. The reversal of 81832121 is 12123818.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 81832121 - 2² = 81832117 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81832151) 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, 7070 + ... + 14616.

It is an arithmetic number, because the mean of its divisors is an integer number (11699400).

Almost surely, 2^81832121 is an apocalyptic number.

It is an amenable number.

81832121 is a deficient number, since it is larger than the sum of its proper divisors (11763079).

81832121 is a wasteful number, since it uses less digits than its factorization.

81832121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9103.

The product of its digits is 768, while the sum is 26.

The square root of 81832121 is about 9046.1108217841. The cubic root of 81832121 is about 434.1514634117.

Adding to 81832121 its reverse (12123818), we get a palindrome (93955939).

The spelling of 81832121 in words is "eighty-one million, eight hundred thirty-two thousand, one hundred twenty-one".