131218181910 has 48 divisors (see below), whose sum is σ = 342096970176. Its totient is φ = 34896161664.

The previous prime is 131218181891. The next prime is 131218181921. The reversal of 131218181910 is 19181812131.

131218181910 is a `hidden beast` number, since 1 + 312 + 181 + 81 + 91 + 0 = 666.

It is a super-3 number, since 3×131218181910³ (a number of 34 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1953319 + ... + 2019378.

It is an arithmetic number, because the mean of its divisors is an integer number (7127020212).

Almost surely, 2^131218181910 is an apocalyptic number.

131218181910 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

131218181910 is an abundant number, since it is smaller than the sum of its proper divisors (210878788266).

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

131218181910 is a wasteful number, since it uses less digits than its factorization.

131218181910 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3973077 (or 3973074 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 36.

The spelling of 131218181910 in words is "one hundred thirty-one billion, two hundred eighteen million, one hundred eighty-one thousand, nine hundred ten".