131220305 has 8 divisors (see below), whose sum is σ = 161126592. Its totient is φ = 102534768.

The previous prime is 131220293. The next prime is 131220329. The reversal of 131220305 is 503022131.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 131220305 - 2¹⁰ = 131219281 is a prime.

It is a Duffinian 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 7 ways as a sum of consecutive naturals, for example, 304949 + ... + 305378.

It is an arithmetic number, because the mean of its divisors is an integer number (20140824).

Almost surely, 2^131220305 is an apocalyptic number.

It is an amenable number.

131220305 is a deficient number, since it is larger than the sum of its proper divisors (29906287).

131220305 is an equidigital number, since it uses as much as digits as its factorization.

131220305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 610375.

The product of its (nonzero) digits is 180, while the sum is 17.

The square root of 131220305 is about 11455.1431680272. The cubic root of 131220305 is about 508.1598493074.

Adding to 131220305 its reverse (503022131), we get a palindrome (634242436).

The spelling of 131220305 in words is "one hundred thirty-one million, two hundred twenty thousand, three hundred five".