219997825 has 6 divisors (see below), whose sum is σ = 272797334. Its totient is φ = 175998240.

The previous prime is 219997807. The next prime is 219997849. The reversal of 219997825 is 528799912.

It can be written as a sum of positive squares in 3 ways, for example, as 24641296 + 195356529 = 4964^2 + 13977^2 .

It is not a de Polignac number, because 219997825 - 2⁹ = 219997313 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 4399932 + ... + 4399981.

Almost surely, 2^219997825 is an apocalyptic number.

219997825 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

219997825 is a deficient number, since it is larger than the sum of its proper divisors (52799509).

219997825 is an equidigital number, since it uses as much as digits as its factorization.

219997825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8799923 (or 8799918 counting only the distinct ones).

The product of its digits is 816480, while the sum is 52.

The square root of 219997825 is about 14832.3236547751. The cubic root of 219997825 is about 603.6790842697.

The spelling of 219997825 in words is "two hundred nineteen million, nine hundred ninety-seven thousand, eight hundred twenty-five".