131686236 has 90 divisors (see below), whose sum is σ = 378507360. Its totient is φ = 39893040.

The previous prime is 131686231. The next prime is 131686271. The reversal of 131686236 is 632686131.

131686236 is a `hidden beast` number, since 13 + 16 + 8 + 623 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 131686236.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131686231) by changing a digit.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 37525 + ... + 40883.

Almost surely, 2^131686236 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 131686236, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (189253680).

131686236 is an abundant number, since it is smaller than the sum of its proper divisors (246821124).

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

131686236 is a wasteful number, since it uses less digits than its factorization.

131686236 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3397 (or 3375 counting only the distinct ones).

The product of its digits is 31104, while the sum is 36.

The square root of 131686236 is about 11475.4623436269. The cubic root of 131686236 is about 508.7605890175.

The spelling of 131686236 in words is "one hundred thirty-one million, six hundred eighty-six thousand, two hundred thirty-six".