131818939 has 8 divisors (see below), whose sum is σ = 150840288. Its totient is φ = 112845120.

The previous prime is 131818937. The next prime is 131818943. The reversal of 131818939 is 939818131.

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 131818939 - 2¹ = 131818937 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 131818895 and 131818904.

It is not an unprimeable number, because it can be changed into a prime (131818931) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 5722 + ... + 17215.

It is an arithmetic number, because the mean of its divisors is an integer number (18855036).

Almost surely, 2^131818939 is an apocalyptic number.

131818939 is a deficient number, since it is larger than the sum of its proper divisors (19021349).

131818939 is an equidigital number, since it uses as much as digits as its factorization.

131818939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23765.

The product of its digits is 46656, while the sum is 43.

The square root of 131818939 is about 11481.2429205204. The cubic root of 131818939 is about 508.9314279063.

The spelling of 131818939 in words is "one hundred thirty-one million, eight hundred eighteen thousand, nine hundred thirty-nine".