81004801 has 4 divisors (see below), whose sum is σ = 83798100. Its totient is φ = 78211504.

The previous prime is 81004769. The next prime is 81004837. The reversal of 81004801 is 10840018.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 37761025 + 43243776 = 6145^2 + 6576^2 .

It is a cyclic number.

It is not a de Polignac number, because 81004801 - 2⁵ = 81004769 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81004501) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1396606 + ... + 1396663.

It is an arithmetic number, because the mean of its divisors is an integer number (20949525).

Almost surely, 2^81004801 is an apocalyptic number.

It is an amenable number.

81004801 is a deficient number, since it is larger than the sum of its proper divisors (2793299).

81004801 is a wasteful number, since it uses less digits than its factorization.

81004801 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2793298.

The product of its (nonzero) digits is 256, while the sum is 22.

The square root of 81004801 is about 9000.2667182701. The cubic root of 81004801 is about 432.6834193680.

Adding to 81004801 its reverse (10840018), we get a palindrome (91844819).

The spelling of 81004801 in words is "eighty-one million, four thousand, eight hundred one".