2109694705 has 4 divisors (see below), whose sum is σ = 2531633652. Its totient is φ = 1687755760.

The previous prime is 2109694693. The next prime is 2109694709. The reversal of 2109694705 is 5074969012.

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 1470262336 + 639432369 = 38344^2 + 25287^2 .

It is not a de Polignac number, because 2109694705 - 2⁹ = 2109694193 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2109694709) 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, 210969466 + ... + 210969475.

It is an arithmetic number, because the mean of its divisors is an integer number (632908413).

Almost surely, 2^2109694705 is an apocalyptic number.

It is an amenable number.

2109694705 is a deficient number, since it is larger than the sum of its proper divisors (421938947).

2109694705 is an equidigital number, since it uses as much as digits as its factorization.

2109694705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 421938946.

The product of its (nonzero) digits is 136080, while the sum is 43.

The square root of 2109694705 is about 45931.4130525069. The cubic root of 2109694705 is about 1282.5467493697.

The spelling of 2109694705 in words is "two billion, one hundred nine million, six hundred ninety-four thousand, seven hundred five".