213243525 has 72 divisors (see below), whose sum is σ = 431177760. Its totient is φ = 99792000.

The previous prime is 213243509. The next prime is 213243533. The reversal of 213243525 is 525342312.

It is a happy number.

213243525 is a `hidden beast` number, since 2 + 132 + 4 + 3 + 525 = 666.

It is not a de Polignac number, because 213243525 - 2⁴ = 213243509 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 70290 + ... + 73260.

It is an arithmetic number, because the mean of its divisors is an integer number (5988580).

Almost surely, 2^213243525 is an apocalyptic number.

213243525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

213243525 is an abundant number, since it is smaller than the sum of its proper divisors (217934235).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

213243525 is a wasteful number, since it uses less digits than its factorization.

213243525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3027 (or 3019 counting only the distinct ones).

The product of its digits is 7200, while the sum is 27.

The square root of 213243525 is about 14602.8601650499. The cubic root of 213243525 is about 597.4367737116.

Adding to 213243525 its reverse (525342312), we get a palindrome (738585837).

The spelling of 213243525 in words is "two hundred thirteen million, two hundred forty-three thousand, five hundred twenty-five".