2154005352109 has 4 divisors (see below), whose sum is σ = 2319698071516. Its totient is φ = 1988312632704.

The previous prime is 2154005352073. The next prime is 2154005352137. The reversal of 2154005352109 is 9012535004512.

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 635084674084 + 1518920678025 = 796922^2 + 1232445^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2154005352109 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2154005352199) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 82846359684 + ... + 82846359709.

It is an arithmetic number, because the mean of its divisors is an integer number (579924517879).

Almost surely, 2^{2154005352109} is an apocalyptic number.

It is an amenable number.

2154005352109 is a deficient number, since it is larger than the sum of its proper divisors (165692719407).

2154005352109 is a wasteful number, since it uses less digits than its factorization.

2154005352109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165692719406.

The product of its (nonzero) digits is 54000, while the sum is 37.

The spelling of 2154005352109 in words is "two trillion, one hundred fifty-four billion, five million, three hundred fifty-two thousand, one hundred nine".