81013801 has 4 divisors (see below), whose sum is σ = 88378704. Its totient is φ = 73648900.

The previous prime is 81013783. The next prime is 81013811. The reversal of 81013801 is 10831018.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81013801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81013811) 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, 3682435 + ... + 3682456.

It is an arithmetic number, because the mean of its divisors is an integer number (22094676).

Almost surely, 2^81013801 is an apocalyptic number.

It is an amenable number.

81013801 is a deficient number, since it is larger than the sum of its proper divisors (7364903).

81013801 is a wasteful number, since it uses less digits than its factorization.

81013801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7364902.

The product of its (nonzero) digits is 192, while the sum is 22.

The square root of 81013801 is about 9000.7666895660. The cubic root of 81013801 is about 432.6994431366.

Adding to 81013801 its reverse (10831018), we get a palindrome (91844819).

The spelling of 81013801 in words is "eighty-one million, thirteen thousand, eight hundred one".