81011801 has 8 divisors (see below), whose sum is σ = 91835520. Its totient is φ = 70844112.

The previous prime is 81011741. The next prime is 81011803. The reversal of 81011801 is 10811018.

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 81011801 - 2⁶ = 81011737 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81011803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 163745 + ... + 164238.

It is an arithmetic number, because the mean of its divisors is an integer number (11479440).

Almost surely, 2^81011801 is an apocalyptic number.

It is an amenable number.

81011801 is a deficient number, since it is larger than the sum of its proper divisors (10823719).

81011801 is a wasteful number, since it uses less digits than its factorization.

81011801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 328015.

The product of its (nonzero) digits is 64, while the sum is 20.

The square root of 81011801 is about 9000.6555872336. The cubic root of 81011801 is about 432.6958824017.

Adding to 81011801 its reverse (10811018), we get a palindrome (91822819).

The spelling of 81011801 in words is "eighty-one million, eleven thousand, eight hundred one".