81230201 has 8 divisors (see below), whose sum is σ = 87549000. Its totient is φ = 74921472.

The previous prime is 81230173. The next prime is 81230209. The reversal of 81230201 is 10203218.

It can be written as a sum of positive squares in 4 ways, for example, as 3367225 + 77862976 = 1835^2 + 8824^2 .

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 81230201 - 2¹⁰ = 81229177 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 81230201.

It is not an unprimeable number, because it can be changed into a prime (81230209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28175 + ... + 30923.

It is an arithmetic number, because the mean of its divisors is an integer number (10943625).

Almost surely, 2^81230201 is an apocalyptic number.

It is an amenable number.

81230201 is a deficient number, since it is larger than the sum of its proper divisors (6318799).

81230201 is a wasteful number, since it uses less digits than its factorization.

81230201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5035.

The product of its (nonzero) digits is 96, while the sum is 17.

The square root of 81230201 is about 9012.7798708279. The cubic root of 81230201 is about 433.0843689549.

Adding to 81230201 its reverse (10203218), we get a palindrome (91433419).

It can be divided in two parts, 812 and 30201, that added together give a palindrome (31013).

The spelling of 81230201 in words is "eighty-one million, two hundred thirty thousand, two hundred one".