213643525 has 12 divisors (see below), whose sum is σ = 266062212. Its totient is φ = 170176640.

The previous prime is 213643523. The next prime is 213643613. The reversal of 213643525 is 525346312.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 74529 + 213568996 = 273^2 + 14614^2 .

It is not a de Polignac number, because 213643525 - 2¹ = 213643523 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 (213643523) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12514 + ... + 24163.

It is an arithmetic number, because the mean of its divisors is an integer number (22171851).

Almost surely, 2^213643525 is an apocalyptic number.

213643525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

213643525 is a deficient number, since it is larger than the sum of its proper divisors (52418687).

213643525 is a wasteful number, since it uses less digits than its factorization.

213643525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36920 (or 36915 counting only the distinct ones).

The product of its digits is 21600, while the sum is 31.

The square root of 213643525 is about 14616.5496954651. The cubic root of 213643525 is about 597.8100956259.

Adding to 213643525 its reverse (525346312), we get a palindrome (738989837).

The spelling of 213643525 in words is "two hundred thirteen million, six hundred forty-three thousand, five hundred twenty-five".