131820518 has 8 divisors (see below), whose sum is σ = 208137720. Its totient is φ = 62441280.

The previous prime is 131820509. The next prime is 131820523. The reversal of 131820518 is 815028131.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1734443 + ... + 1734518.

It is an arithmetic number, because the mean of its divisors is an integer number (26017215).

Almost surely, 2^131820518 is an apocalyptic number.

131820518 is a deficient number, since it is larger than the sum of its proper divisors (76317202).

131820518 is a wasteful number, since it uses less digits than its factorization.

131820518 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3468982.

The product of its (nonzero) digits is 1920, while the sum is 29.

The square root of 131820518 is about 11481.3116846465. The cubic root of 131820518 is about 508.9334599853.

Adding to 131820518 its reverse (815028131), we get a palindrome (946848649).

The spelling of 131820518 in words is "one hundred thirty-one million, eight hundred twenty thousand, five hundred eighteen".