10101010091 has 4 divisors (see below), whose sum is σ = 10133912712. Its totient is φ = 10068107472.

The previous prime is 10101010079. The next prime is 10101010163. The reversal of 10101010091 is 19001010101.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 10101010091 - 2²² = 10096815787 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (10101010061) 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, 16450850 + ... + 16451463.

It is an arithmetic number, because the mean of its divisors is an integer number (2533478178).

Almost surely, 2^10101010091 is an apocalyptic number.

10101010091 is a deficient number, since it is larger than the sum of its proper divisors (32902621).

10101010091 is an equidigital number, since it uses as much as digits as its factorization.

10101010091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32902620.

The product of its (nonzero) digits is 9, while the sum is 14.

Adding to 10101010091 its reverse (19001010101), we get a palindrome (29102020192).

It can be divided in two parts, 1010 and 1010091, that added together give a palindrome (1011101).

The spelling of 10101010091 in words is "ten billion, one hundred one million, ten thousand, ninety-one".