81422241 has 8 divisors (see below), whose sum is σ = 109255104. Its totient is φ = 53935440.

The previous prime is 81422207. The next prime is 81422291. The reversal of 81422241 is 14222418.

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

It is not a de Polignac number, because 81422241 - 2⁹ = 81421729 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81422291) 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, 85965 + ... + 86906.

It is an arithmetic number, because the mean of its divisors is an integer number (13656888).

Almost surely, 2^81422241 is an apocalyptic number.

It is an amenable number.

81422241 is a deficient number, since it is larger than the sum of its proper divisors (27832863).

81422241 is a wasteful number, since it uses less digits than its factorization.

81422241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173031.

The product of its digits is 1024, while the sum is 24.

The square root of 81422241 is about 9023.4273422021. The cubic root of 81422241 is about 433.4253918156.

Adding to 81422241 its reverse (14222418), we get a palindrome (95644659).

The spelling of 81422241 in words is "eighty-one million, four hundred twenty-two thousand, two hundred forty-one".