231223525 has 24 divisors (see below), whose sum is σ = 319432680. Its totient is φ = 164855040.

The previous prime is 231223507. The next prime is 231223541. The reversal of 231223525 is 525322132.

It can be written as a sum of positive squares in 12 ways, for example, as 172501956 + 58721569 = 13134^2 + 7663^2 .

It is not a de Polignac number, because 231223525 - 2¹¹ = 231221477 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a self number, because there is not a number n which added to its sum of digits gives 231223525.

It is a congruent 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 23 ways as a sum of consecutive naturals, for example, 2842 + ... + 21691.

It is an arithmetic number, because the mean of its divisors is an integer number (13309695).

Almost surely, 2^231223525 is an apocalyptic number.

231223525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

231223525 is a deficient number, since it is larger than the sum of its proper divisors (88209155).

231223525 is a wasteful number, since it uses less digits than its factorization.

231223525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24585 (or 24580 counting only the distinct ones).

The product of its digits is 3600, while the sum is 25.

The square root of 231223525 is about 15206.0358081914. The cubic root of 231223525 is about 613.7770882474. Note that the first 3 decimals are identical.

Adding to 231223525 its reverse (525322132), we get a palindrome (756545657).

The spelling of 231223525 in words is "two hundred thirty-one million, two hundred twenty-three thousand, five hundred twenty-five".