131333220 has 72 divisors (see below), whose sum is σ = 415711296. Its totient is φ = 33498432.

The previous prime is 131333203. The next prime is 131333227. The reversal of 131333220 is 22333131.

131333220 is a `hidden beast` number, since 1 + 313 + 332 + 20 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 131333193 and 131333202.

It is not an unprimeable number, because it can be changed into a prime (131333227) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 11722 + ... + 20001.

It is an arithmetic number, because the mean of its divisors is an integer number (5773768).

Almost surely, 2^131333220 is an apocalyptic number.

131333220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

131333220 is an abundant number, since it is smaller than the sum of its proper divisors (284378076).

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

131333220 is a wasteful number, since it uses less digits than its factorization.

131333220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31761 (or 31756 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 18.

The square root of 131333220 is about 11460.0706804103. The cubic root of 131333220 is about 508.3055646093.

Adding to 131333220 its reverse (22333131), we get a palindrome (153666351).

The spelling of 131333220 in words is "one hundred thirty-one million, three hundred thirty-three thousand, two hundred twenty".