2106208549 has 16 divisors (see below), whose sum is σ = 2221755120. Its totient is φ = 1993743360.

The previous prime is 2106208529. The next prime is 2106208567. The reversal of 2106208549 is 9458026012.

It can be written as a sum of positive squares in 8 ways, for example, as 116424100 + 1989784449 = 10790^2 + 44607^2 .

It is a cyclic number.

It is not a de Polignac number, because 2106208549 - 2¹⁹ = 2105684261 is a prime.

It is a super-2 number, since 2×2106208549² = 8872228903761370802, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2106208529) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 594387 + ... + 597919.

It is an arithmetic number, because the mean of its divisors is an integer number (138859695).

Almost surely, 2^2106208549 is an apocalyptic number.

2106208549 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

2106208549 is a deficient number, since it is larger than the sum of its proper divisors (115546571).

2106208549 is a wasteful number, since it uses less digits than its factorization.

2106208549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3960.

The product of its (nonzero) digits is 34560, while the sum is 37.

The square root of 2106208549 is about 45893.4477785228. The cubic root of 2106208549 is about 1281.8399135922.

The spelling of 2106208549 in words is "two billion, one hundred six million, two hundred eight thousand, five hundred forty-nine".