131223525 has 12 divisors (see below), whose sum is σ = 216956352. Its totient is φ = 69985840.

The previous prime is 131223517. The next prime is 131223539. The reversal of 131223525 is 525322131.

It is a happy number.

It is not a de Polignac number, because 131223525 - 2³ = 131223517 is a prime.

It is a super-2 number, since 2×131223525² = 34439227026851250, which contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 131223495 and 131223504.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 874749 + ... + 874898.

It is an arithmetic number, because the mean of its divisors is an integer number (18079696).

Almost surely, 2^131223525 is an apocalyptic number.

131223525 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

131223525 is a deficient number, since it is larger than the sum of its proper divisors (85732827).

131223525 is a wasteful number, since it uses less digits than its factorization.

131223525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1749660 (or 1749655 counting only the distinct ones).

The product of its digits is 1800, while the sum is 24.

The square root of 131223525 is about 11455.2837153865. The cubic root of 131223525 is about 508.1640058321.

Adding to 131223525 its reverse (525322131), we get a palindrome (656545656).

The spelling of 131223525 in words is "one hundred thirty-one million, two hundred twenty-three thousand, five hundred twenty-five".