131513218 has 16 divisors (see below), whose sum is σ = 206718336. Its totient is φ = 62631360.

The previous prime is 131513197. The next prime is 131513233. The reversal of 131513218 is 812315131.

It is a junction number, because it is equal to n+sod(n) for n = 131513192 and 131513201.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5155 + ... + 17017.

It is an arithmetic number, because the mean of its divisors is an integer number (12919896).

Almost surely, 2^131513218 is an apocalyptic number.

131513218 is a deficient number, since it is larger than the sum of its proper divisors (75205118).

131513218 is a wasteful number, since it uses less digits than its factorization.

131513218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12129.

The product of its digits is 720, while the sum is 25.

The square root of 131513218 is about 11467.9212588856. The cubic root of 131513218 is about 508.5376770379.

Adding to 131513218 its reverse (812315131), we get a palindrome (943828349).

The spelling of 131513218 in words is "one hundred thirty-one million, five hundred thirteen thousand, two hundred eighteen".