131323220 has 24 divisors (see below), whose sum is σ = 315176064. Its totient is φ = 45025056.

The previous prime is 131323189. The next prime is 131323253. The reversal of 131323220 is 22323131.

It is a super-2 number, since 2×131323220² = 34491576222336800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 468872 + ... + 469151.

It is an arithmetic number, because the mean of its divisors is an integer number (13132336).

Almost surely, 2^131323220 is an apocalyptic number.

131323220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

131323220 is an abundant number, since it is smaller than the sum of its proper divisors (183852844).

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

131323220 is a wasteful number, since it uses less digits than its factorization.

131323220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 938039 (or 938037 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 17.

The square root of 131323220 is about 11459.6343746212. The cubic root of 131323220 is about 508.2926631142.

Adding to 131323220 its reverse (22323131), we get a palindrome (153646351).

The spelling of 131323220 in words is "one hundred thirty-one million, three hundred twenty-three thousand, two hundred twenty".