810011010101 has 4 divisors (see below), whose sum is σ = 810012825804. Its totient is φ = 810009194400.

The previous prime is 810011010079. The next prime is 810011010157. The reversal of 810011010101 is 101010110018.

It is a happy number.

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 338460987076 + 471550023025 = 581774^2 + 686695^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-810011010101 is a prime.

It is a super-2 number, since 2×810011010101² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (810011010181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 275291 + ... + 1302231.

It is an arithmetic number, because the mean of its divisors is an integer number (202503206451).

Almost surely, 2^810011010101 is an apocalyptic number.

It is an amenable number.

810011010101 is a deficient number, since it is larger than the sum of its proper divisors (1815703).

810011010101 is a wasteful number, since it uses less digits than its factorization.

810011010101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1815702.

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 810011010101 its reverse (101010110018), we get a palindrome (911021120119).

The spelling of 810011010101 in words is "eight hundred ten billion, eleven million, ten thousand, one hundred one".