81036001 has 4 divisors (see below), whose sum is σ = 81390100. Its totient is φ = 80681904.

The previous prime is 81035987. The next prime is 81036019. The reversal of 81036001 is 10063018.

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 64641600 + 16394401 = 8040^2 + 4049^2 .

It is a cyclic number.

It is not a de Polignac number, because 81036001 - 2¹³ = 81027809 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 81036001.

It is not an unprimeable number, because it can be changed into a prime (81036041) 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 3 ways as a sum of consecutive naturals, for example, 176706 + ... + 177163.

It is an arithmetic number, because the mean of its divisors is an integer number (20347525).

Almost surely, 2^81036001 is an apocalyptic number.

It is an amenable number.

81036001 is a deficient number, since it is larger than the sum of its proper divisors (354099).

81036001 is a wasteful number, since it uses less digits than its factorization.

81036001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 354098.

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 81036001 is about 9001.9998333704. Note that the first 3 decimals coincide. The cubic root of 81036001 is about 432.7389633592.

Adding to 81036001 its reverse (10063018), we get a palindrome (91099019).

The spelling of 81036001 in words is "eighty-one million, thirty-six thousand, one".