213609925 has 6 divisors (see below), whose sum is σ = 264876338. Its totient is φ = 170887920.

The previous prime is 213609923. The next prime is 213609931. The reversal of 213609925 is 529906312.

It can be written as a sum of positive squares in 3 ways, for example, as 26440164 + 187169761 = 5142^2 + 13681^2 .

It is not a de Polignac number, because 213609925 - 2¹ = 213609923 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213609923) 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 5 ways as a sum of consecutive naturals, for example, 4272174 + ... + 4272223.

Almost surely, 2^213609925 is an apocalyptic number.

213609925 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

213609925 is a deficient number, since it is larger than the sum of its proper divisors (51266413).

213609925 is an equidigital number, since it uses as much as digits as its factorization.

213609925 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8544407 (or 8544402 counting only the distinct ones).

The product of its (nonzero) digits is 29160, while the sum is 37.

The square root of 213609925 is about 14615.4002682102. The cubic root of 213609925 is about 597.7787545211.

The spelling of 213609925 in words is "two hundred thirteen million, six hundred nine thousand, nine hundred twenty-five".