131220525 has 24 divisors (see below), whose sum is σ = 217289664. Its totient is φ = 69875200.

The previous prime is 131220521. The next prime is 131220539. The reversal of 131220525 is 525022131.

It is not a de Polignac number, because 131220525 - 2² = 131220521 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131220521) by changing a digit.

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, 76477 + ... + 78173.

It is an arithmetic number, because the mean of its divisors is an integer number (9053736).

Almost surely, 2^131220525 is an apocalyptic number.

131220525 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

131220525 is a deficient number, since it is larger than the sum of its proper divisors (86069139).

131220525 is a wasteful number, since it uses less digits than its factorization.

131220525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2741 (or 2736 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 21.

The square root of 131220525 is about 11455.1527706967. The cubic root of 131220525 is about 508.1601332957.

Adding to 131220525 its reverse (525022131), we get a palindrome (656242656).

The spelling of 131220525 in words is "one hundred thirty-one million, two hundred twenty thousand, five hundred twenty-five".