131503820 has 48 divisors (see below), whose sum is σ = 316723008. Its totient is φ = 44928000.

The previous prime is 131503783. The next prime is 131503837. The reversal of 131503820 is 28305131.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42320 + ... + 45320.

It is an arithmetic number, because the mean of its divisors is an integer number (6598396).

Almost surely, 2^131503820 is an apocalyptic number.

131503820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 131503820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (158361504).

131503820 is an abundant number, since it is smaller than the sum of its proper divisors (185219188).

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

131503820 is a wasteful number, since it uses less digits than its factorization.

131503820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3330 (or 3328 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 131503820 is about 11467.5114998852. The cubic root of 131503820 is about 508.5255632976.

Adding to 131503820 its reverse (28305131), we get a palindrome (159808951).

The spelling of 131503820 in words is "one hundred thirty-one million, five hundred three thousand, eight hundred twenty".