131125530 has 64 divisors (see below), whose sum is σ = 339759360. Its totient is φ = 32288256.

The previous prime is 131125529. The next prime is 131125537. The reversal of 131125530 is 35521131.

It is a junction number, because it is equal to n+sod(n) for n = 131125497 and 131125506.

It is not an unprimeable number, because it can be changed into a prime (131125537) 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 31 ways as a sum of consecutive naturals, for example, 16734 + ... + 23286.

It is an arithmetic number, because the mean of its divisors is an integer number (5308740).

Almost surely, 2^131125530 is an apocalyptic number.

131125530 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 131125530, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (169879680).

131125530 is an abundant number, since it is smaller than the sum of its proper divisors (208633830).

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

131125530 is a wasteful number, since it uses less digits than its factorization.

131125530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6615.

The product of its (nonzero) digits is 450, while the sum is 21.

The square root of 131125530 is about 11451.0056326944. The cubic root of 131125530 is about 508.0374788931.

Adding to 131125530 its reverse (35521131), we get a palindrome (166646661).

The spelling of 131125530 in words is "one hundred thirty-one million, one hundred twenty-five thousand, five hundred thirty".