81031104001 has 4 divisors (see below), whose sum is σ = 81034161412. Its totient is φ = 81028046592.

The previous prime is 81031103999. The next prime is 81031104013. The reversal of 81031104001 is 10040113018.

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 35645062401 + 45386041600 = 188799^2 + 213040^2 .

It is a cyclic number.

It is not a de Polignac number, because 81031104001 - 2¹ = 81031103999 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 81031104001.

It is not an unprimeable number, because it can be changed into a prime (81031104041) 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, 1488600 + ... + 1542073.

It is an arithmetic number, because the mean of its divisors is an integer number (20258540353).

Almost surely, 2^81031104001 is an apocalyptic number.

It is an amenable number.

81031104001 is a deficient number, since it is larger than the sum of its proper divisors (3057411).

81031104001 is a wasteful number, since it uses less digits than its factorization.

81031104001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3057410.

The product of its (nonzero) digits is 96, while the sum is 19.

Adding to 81031104001 its reverse (10040113018), we get a palindrome (91071217019).

The spelling of 81031104001 in words is "eighty-one billion, thirty-one million, one hundred four thousand, one".