131205331 has 4 divisors (see below), whose sum is σ = 131406912. Its totient is φ = 131003752.

The previous prime is 131205323. The next prime is 131205359. The reversal of 131205331 is 133502131.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 131205331 - 2³ = 131205323 is a prime.

It is a super-2 number, since 2×131205331² = 34429677765639122, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 131205299 and 131205308.

It is not an unprimeable number, because it can be changed into a prime (131205301) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 99811 + ... + 101116.

It is an arithmetic number, because the mean of its divisors is an integer number (32851728).

Almost surely, 2^131205331 is an apocalyptic number.

131205331 is a deficient number, since it is larger than the sum of its proper divisors (201581).

131205331 is an equidigital number, since it uses as much as digits as its factorization.

131205331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 201580.

The product of its (nonzero) digits is 270, while the sum is 19.

The square root of 131205331 is about 11454.4895565014. The cubic root of 131205331 is about 508.1405192831.

Adding to 131205331 its reverse (133502131), we get a palindrome (264707462).

The spelling of 131205331 in words is "one hundred thirty-one million, two hundred five thousand, three hundred thirty-one".