131220232 has 64 divisors (see below), whose sum is σ = 304315200. Its totient is φ = 52151040.

The previous prime is 131220223. The next prime is 131220253. The reversal of 131220232 is 232022131.

It is a super-2 number, since 2×131220232² = 34437498572267648, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18718 + ... + 24754.

It is an arithmetic number, because the mean of its divisors is an integer number (4754925).

Almost surely, 2^131220232 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 131220232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (152157600).

131220232 is an abundant number, since it is smaller than the sum of its proper divisors (173094968).

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

131220232 is a wasteful number, since it uses less digits than its factorization.

131220232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6086 (or 6082 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 131220232 is about 11455.1399816851. The cubic root of 131220232 is about 508.1597550748.

Adding to 131220232 its reverse (232022131), we get a palindrome (363242363).

The spelling of 131220232 in words is "one hundred thirty-one million, two hundred twenty thousand, two hundred thirty-two".