131136138 has 144 divisors (see below), whose sum is σ = 363199680. Its totient is φ = 34350480.

The previous prime is 131136121. The next prime is 131136149. The reversal of 131136138 is 831631131.

131136138 is a `hidden beast` number, since 1 + 31 + 13 + 613 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 4230183 + ... + 4230213.

It is an arithmetic number, because the mean of its divisors is an integer number (2522220).

Almost surely, 2^131136138 is an apocalyptic number.

131136138 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 131136138, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (181599840).

131136138 is an abundant number, since it is smaller than the sum of its proper divisors (232063542).

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

131136138 is a wasteful number, since it uses less digits than its factorization.

131136138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118 (or 62 counting only the distinct ones).

The product of its digits is 1296, while the sum is 27.

The square root of 131136138 is about 11451.4688140867. The cubic root of 131136138 is about 508.0511785295.

Adding to 131136138 its reverse (831631131), we get a palindrome (962767269).

The spelling of 131136138 in words is "one hundred thirty-one million, one hundred thirty-six thousand, one hundred thirty-eight".