2154705109 has 4 divisors (see below), whose sum is σ = 2161502604. Its totient is φ = 2147907616.

The previous prime is 2154705107. The next prime is 2154705151. The reversal of 2154705109 is 9015074512.

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 49914225 + 2104790884 = 7065^2 + 45878^2 .

It is a cyclic number.

It is not a de Polignac number, because 2154705109 - 2¹ = 2154705107 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 (2154705107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3398272 + ... + 3398905.

It is an arithmetic number, because the mean of its divisors is an integer number (540375651).

Almost surely, 2^2154705109 is an apocalyptic number.

It is an amenable number.

2154705109 is a deficient number, since it is larger than the sum of its proper divisors (6797495).

2154705109 is an equidigital number, since it uses as much as digits as its factorization.

2154705109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6797494.

The product of its (nonzero) digits is 12600, while the sum is 34.

The square root of 2154705109 is about 46418.8012447543. The cubic root of 2154705109 is about 1291.6037000583.

The spelling of 2154705109 in words is "two billion, one hundred fifty-four million, seven hundred five thousand, one hundred nine".