131220342 has 48 divisors (see below), whose sum is σ = 312586560. Its totient is φ = 39452400.

The previous prime is 131220329. The next prime is 131220361. The reversal of 131220342 is 243022131.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 23409 + ... + 28467.

It is an arithmetic number, because the mean of its divisors is an integer number (6512220).

Almost surely, 2^131220342 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 131220342, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (156293280).

131220342 is an abundant number, since it is smaller than the sum of its proper divisors (181366218).

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

131220342 is a wasteful number, since it uses less digits than its factorization.

131220342 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5209 (or 5206 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 131220342 is about 11455.1447830222. The cubic root of 131220342 is about 508.1598970691.

Adding to 131220342 its reverse (243022131), we get a palindrome (374242473).

The spelling of 131220342 in words is "one hundred thirty-one million, two hundred twenty thousand, three hundred forty-two".