131321318 has 4 divisors (see below), whose sum is σ = 196981980. Its totient is φ = 65660658.

The previous prime is 131321317. The next prime is 131321321. The reversal of 131321318 is 813123131.

131321318 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

It is a super-2 number, since 2×131321318² = 34490577122514248, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 131321293 and 131321302.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131321317) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32830328 + ... + 32830331.

It is an arithmetic number, because the mean of its divisors is an integer number (49245495).

Almost surely, 2^131321318 is an apocalyptic number.

131321318 is a deficient number, since it is larger than the sum of its proper divisors (65660662).

131321318 is an equidigital number, since it uses as much as digits as its factorization.

131321318 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65660661.

The product of its digits is 432, while the sum is 23.

The square root of 131321318 is about 11459.5513873799. The cubic root of 131321318 is about 508.2902091758.

Adding to 131321318 its reverse (813123131), we get a palindrome (944444449).

The spelling of 131321318 in words is "one hundred thirty-one million, three hundred twenty-one thousand, three hundred eighteen".