2109495457 has 4 divisors (see below), whose sum is σ = 2109626500. Its totient is φ = 2109364416.

The previous prime is 2109495433. The next prime is 2109495461. The reversal of 2109495457 is 7545949012.

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 1777381281 + 332114176 = 42159^2 + 18224^2 .

It is a cyclic number.

It is not a de Polignac number, because 2109495457 - 2⁷ = 2109495329 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2109495257) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37332 + ... + 74917.

It is an arithmetic number, because the mean of its divisors is an integer number (527406625).

Almost surely, 2^2109495457 is an apocalyptic number.

It is an amenable number.

2109495457 is a deficient number, since it is larger than the sum of its proper divisors (131043).

2109495457 is a wasteful number, since it uses less digits than its factorization.

2109495457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131042.

The product of its (nonzero) digits is 453600, while the sum is 46.

The square root of 2109495457 is about 45929.2440281788. The cubic root of 2109495457 is about 1282.5063718181.

The spelling of 2109495457 in words is "two billion, one hundred nine million, four hundred ninety-five thousand, four hundred fifty-seven".