131121835818 has 16 divisors (see below), whose sum is σ = 267823324800. Its totient is φ = 42777336416.

The previous prime is 131121835813. The next prime is 131121835841. The reversal of 131121835818 is 818538121131.

It is a self number, because there is not a number n which added to its sum of digits gives 131121835818.

It is not an unprimeable number, because it can be changed into a prime (131121835811) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 232485243 + ... + 232485806.

It is an arithmetic number, because the mean of its divisors is an integer number (16738957800).

Almost surely, 2^131121835818 is an apocalyptic number.

131121835818 is an abundant number, since it is smaller than the sum of its proper divisors (136701488982).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

131121835818 is a wasteful number, since it uses less digits than its factorization.

131121835818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 464971101.

The product of its digits is 46080, while the sum is 42.

Adding to 131121835818 its reverse (818538121131), we get a palindrome (949659956949).

The spelling of 131121835818 in words is "one hundred thirty-one billion, one hundred twenty-one million, eight hundred thirty-five thousand, eight hundred eighteen".