131686533 has 16 divisors (see below), whose sum is σ = 212827200. Its totient is φ = 79809840.

The previous prime is 131686519. The next prime is 131686553. The reversal of 131686533 is 335686131.

It is a happy number.

It is not a de Polignac number, because 131686533 - 2⁴ = 131686517 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131686553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 221398 + ... + 221991.

It is an arithmetic number, because the mean of its divisors is an integer number (13301700).

Almost surely, 2^131686533 is an apocalyptic number.

It is an amenable number.

131686533 is a deficient number, since it is larger than the sum of its proper divisors (81140667).

131686533 is a wasteful number, since it uses less digits than its factorization.

131686533 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 443409 (or 443403 counting only the distinct ones).

The product of its digits is 38880, while the sum is 36.

The square root of 131686533 is about 11475.4752842747. The cubic root of 131686533 is about 508.7609714968.

It can be divided in two parts, 13168 and 6533, that added together give a triangular number (19701 = T₁₉₈).

The spelling of 131686533 in words is "one hundred thirty-one million, six hundred eighty-six thousand, five hundred thirty-three".