131533221 has 8 divisors (see below), whose sum is σ = 176106304. Its totient is φ = 87324480.

The previous prime is 131533211. The next prime is 131533253. The reversal of 131533221 is 122335131.

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

It is a de Polignac number, because none of the positive numbers 2^k-131533221 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131533201) 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, 90241 + ... + 91686.

It is an arithmetic number, because the mean of its divisors is an integer number (22013288).

Almost surely, 2^131533221 is an apocalyptic number.

It is an amenable number.

131533221 is a deficient number, since it is larger than the sum of its proper divisors (44573083).

131533221 is a wasteful number, since it uses less digits than its factorization.

131533221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 182171.

The product of its digits is 540, while the sum is 21.

The square root of 131533221 is about 11468.7933541415. The cubic root of 131533221 is about 508.5634583843.

Adding to 131533221 its reverse (122335131), we get a palindrome (253868352).

The spelling of 131533221 in words is "one hundred thirty-one million, five hundred thirty-three thousand, two hundred twenty-one".