213235625 has 20 divisors (see below), whose sum is σ = 273690516. Its totient is φ = 165960000.

The previous prime is 213235621. The next prime is 213235657. The reversal of 213235625 is 526532312.

It can be written as a sum of positive squares in 10 ways, for example, as 67043344 + 146192281 = 8188^2 + 12091^2 .

It is not a de Polignac number, because 213235625 - 2² = 213235621 is a prime.

It is a hoax number, since the sum of its digits (29) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (213235621) 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 19 ways as a sum of consecutive naturals, for example, 18515 + ... + 27735.

Almost surely, 2^213235625 is an apocalyptic number.

213235625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

213235625 is a deficient number, since it is larger than the sum of its proper divisors (60454891).

213235625 is an frugal number, since it uses more digits than its factorization.

213235625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9278 (or 9263 counting only the distinct ones).

The product of its digits is 10800, while the sum is 29.

The square root of 213235625 is about 14602.5896675898. The cubic root of 213235625 is about 597.4293959045.

Adding to 213235625 its reverse (526532312), we get a palindrome (739767937).

The spelling of 213235625 in words is "two hundred thirteen million, two hundred thirty-five thousand, six hundred twenty-five".