209061825 has 24 divisors (see below), whose sum is σ = 395028288. Its totient is φ = 95570880.

The previous prime is 209061821. The next prime is 209061833. The reversal of 209061825 is 528160902.

It is not a de Polignac number, because 209061825 - 2² = 209061821 is a prime.

It is not an unprimeable number, because it can be changed into a prime (209061821) 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 23 ways as a sum of consecutive naturals, for example, 198582 + ... + 199631.

It is an arithmetic number, because the mean of its divisors is an integer number (16459512).

Almost surely, 2^209061825 is an apocalyptic number.

209061825 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

209061825 is a deficient number, since it is larger than the sum of its proper divisors (185966463).

209061825 is a wasteful number, since it uses less digits than its factorization.

209061825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 398233 (or 398228 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 33.

The square root of 209061825 is about 14458.9703990291. The cubic root of 209061825 is about 593.5057248164.

The spelling of 209061825 in words is "two hundred nine million, sixty-one thousand, eight hundred twenty-five".