131222550 has 96 divisors (see below), whose sum is σ = 351227520. Its totient is φ = 32313600.

The previous prime is 131222503. The next prime is 131222603. The reversal of 131222550 is 55222131.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 116289 + ... + 117411.

It is an arithmetic number, because the mean of its divisors is an integer number (3658620).

Almost surely, 2^131222550 is an apocalyptic number.

131222550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 131222550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (175613760).

131222550 is an abundant number, since it is smaller than the sum of its proper divisors (220004970).

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

131222550 is a wasteful number, since it uses less digits than its factorization.

131222550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1198 (or 1193 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 21.

The square root of 131222550 is about 11455.2411585265. The cubic root of 131222550 is about 508.1627472642.

Adding to 131222550 its reverse (55222131), we get a palindrome (186444681).

The spelling of 131222550 in words is "one hundred thirty-one million, two hundred twenty-two thousand, five hundred fifty".