131668521 has 8 divisors (see below), whose sum is σ = 176676864. Its totient is φ = 87219600.

The previous prime is 131668489. The next prime is 131668531. The reversal of 131668521 is 125866131.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 131668521 - 2⁵ = 131668489 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (131668531) 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, 139305 + ... + 140246.

It is an arithmetic number, because the mean of its divisors is an integer number (22084608).

Almost surely, 2^131668521 is an apocalyptic number.

It is an amenable number.

131668521 is a deficient number, since it is larger than the sum of its proper divisors (45008343).

131668521 is a wasteful number, since it uses less digits than its factorization.

131668521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 279711.

The product of its digits is 8640, while the sum is 33.

The square root of 131668521 is about 11474.6904533412. The cubic root of 131668521 is about 508.7377744387.

The spelling of 131668521 in words is "one hundred thirty-one million, six hundred sixty-eight thousand, five hundred twenty-one".