131023220 has 12 divisors (see below), whose sum is σ = 275148804. Its totient is φ = 52409280.

The previous prime is 131023163. The next prime is 131023223. The reversal of 131023220 is 22320131.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 19044496 + 111978724 = 4364^2 + 10582^2 .

It is a junction number, because it is equal to n+sod(n) for n = 131023195 and 131023204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131023223) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3275561 + ... + 3275600.

It is an arithmetic number, because the mean of its divisors is an integer number (22929067).

Almost surely, 2^131023220 is an apocalyptic number.

131023220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

131023220 is an abundant number, since it is smaller than the sum of its proper divisors (144125584).

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

131023220 is a wasteful number, since it uses less digits than its factorization.

131023220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6551170 (or 6551168 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 131023220 is about 11446.5374677236. The cubic root of 131023220 is about 507.9053133297.

Adding to 131023220 its reverse (22320131), we get a palindrome (153343351).

The spelling of 131023220 in words is "one hundred thirty-one million, twenty-three thousand, two hundred twenty".