111010101001001 has 4 divisors (see below), whose sum is σ = 112109210912004. Its totient is φ = 109910991090000.

The previous prime is 111010101000943. The next prime is 111010101001003. The reversal of 111010101001001 is 100100101010111.

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 68236669781401 + 42773431219600 = 8260549^2 + 6540140^2 .

It is a cyclic number.

It is not a de Polignac number, because 111010101001001 - 2¹⁰ = 111010100999977 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 111010101001001.

It is not an unprimeable number, because it can be changed into a prime (111010101001003) 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, 549554955350 + ... + 549554955551.

It is an arithmetic number, because the mean of its divisors is an integer number (28027302728001).

Almost surely, 2^{111010101001001} is an apocalyptic number.

It is an amenable number.

111010101001001 is a deficient number, since it is larger than the sum of its proper divisors (1099109911003).

111010101001001 is a wasteful number, since it uses less digits than its factorization.

111010101001001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1099109911002.

The product of its (nonzero) digits is 1, while the sum is 8.

Adding to 111010101001001 its reverse (100100101010111), we get a palindrome (211110202011112).

The spelling of 111010101001001 in words is "one hundred eleven trillion, ten billion, one hundred one million, one thousand, one".