2108516549 has 4 divisors (see below), whose sum is σ = 2108725836. Its totient is φ = 2108307264.

The previous prime is 2108516519. The next prime is 2108516573. The reversal of 2108516549 is 9456158012.

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 1520454049 + 588062500 = 38993^2 + 24250^2 .

It is a cyclic number.

It is not a de Polignac number, because 2108516549 - 2²⁴ = 2091739333 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2108516519) 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, 88724 + ... + 109949.

It is an arithmetic number, because the mean of its divisors is an integer number (527181459).

Almost surely, 2^2108516549 is an apocalyptic number.

It is an amenable number.

2108516549 is a deficient number, since it is larger than the sum of its proper divisors (209287).

2108516549 is a wasteful number, since it uses less digits than its factorization.

2108516549 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 209286.

The product of its (nonzero) digits is 86400, while the sum is 41.

The square root of 2108516549 is about 45918.5860953928. The cubic root of 2108516549 is about 1282.3079594457.

The spelling of 2108516549 in words is "two billion, one hundred eight million, five hundred sixteen thousand, five hundred forty-nine".