131133220 has 24 divisors (see below), whose sum is σ = 275599800. Its totient is φ = 52411392.

The previous prime is 131133203. The next prime is 131133221. The reversal of 131133220 is 22331131.

It can be written as a sum of positive squares in 4 ways, for example, as 12236004 + 118897216 = 3498^2 + 10904^2 .

It is a junction number, because it is equal to n+sod(n) for n = 131133194 and 131133203.

It is not an unprimeable number, because it can be changed into a prime (131133221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39796 + ... + 42964.

It is an arithmetic number, because the mean of its divisors is an integer number (11483325).

Almost surely, 2^131133220 is an apocalyptic number.

131133220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

131133220 is an abundant number, since it is smaller than the sum of its proper divisors (144466580).

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

131133220 is a wasteful number, since it uses less digits than its factorization.

131133220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5247 (or 5245 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 16.

The square root of 131133220 is about 11451.3414061410. The cubic root of 131133220 is about 508.0474101700.

Adding to 131133220 its reverse (22331131), we get a palindrome (153464351).

The spelling of 131133220 in words is "one hundred thirty-one million, one hundred thirty-three thousand, two hundred twenty".